diff --git a/HongikYeolgong2/Domain/Interactors/UserDataInteractor.swift b/HongikYeolgong2/Domain/Interactors/UserDataInteractor.swift
index e126003..7154ff3 100644
--- a/HongikYeolgong2/Domain/Interactors/UserDataInteractor.swift
+++ b/HongikYeolgong2/Domain/Interactors/UserDataInteractor.swift
@@ -110,7 +110,7 @@ final class UserDataInteractorImpl: UserDataInteractor {
                 receiveCompletion: { [weak self] completion in
                     guard let self = self else { return }
                     switch completion {
-                    case .finished:
+                    case .finished:                        
                         appState[\.appLaunchState] = .authenticated
                     case let .failure(error):
                         appState[\.appLaunchState] = .notAuthenticated
diff --git a/HongikYeolgong2/Presentation/Auth/OnboardingView.swift b/HongikYeolgong2/Presentation/Auth/OnboardingView.swift
index 5dabd5a..580a57a 100644
--- a/HongikYeolgong2/Presentation/Auth/OnboardingView.swift
+++ b/HongikYeolgong2/Presentation/Auth/OnboardingView.swift
@@ -19,6 +19,7 @@ struct OnboardingView: View {
             content
                 .onReceive(routingUpdate) { self.routingState = $0 }
         }
+        .navigationViewStyle(.stack)
     }
     
     // MARK: - Main Contents
diff --git a/HongikYeolgong2/Presentation/Auth/SignUpView.swift b/HongikYeolgong2/Presentation/Auth/SignUpView.swift
index 375f442..2c4aafe 100644
--- a/HongikYeolgong2/Presentation/Auth/SignUpView.swift
+++ b/HongikYeolgong2/Presentation/Auth/SignUpView.swift
@@ -9,12 +9,17 @@ import SwiftUI
 import Combine
 
 struct SignUpView: View {
+    @Environment(\.injected.appState) var appState
     @Environment(\.injected.interactors.userDataInteractor) var userDataInetractor
-    
+    @Environment(\.presentationMode) var presentationMode
     @State private var signupData = SignupData()
     @State private var isSubmitButtonAvailable = false
     @State private var isCheckButtonAvailable = false
     
+    init() {
+        UINavigationBar.setAnimationsEnabled(false)
+    }
+    
     var body: some View {
         content
             .onChange(of: signupData.nickname, perform: { validateUserNickname(nickname: $0)} )
diff --git a/HongikYeolgong2/Presentation/Home/HomeView.swift b/HongikYeolgong2/Presentation/Home/HomeView.swift
index 2c88ab9..1a46c7b 100644
--- a/HongikYeolgong2/Presentation/Home/HomeView.swift
+++ b/HongikYeolgong2/Presentation/Home/HomeView.swift
@@ -80,9 +80,11 @@ struct HomeView: View {
         }
         .padding(.horizontal, 32.adjustToScreenWidth)
         .modifier(GradientBackground())
-        .onAppear { permissions.request(permission: .localNotifications) }
-        .onAppear { weeklyStudyInteractor.getWeekyStudy(studyRecords: $studyRecords) }
-        .onAppear { weeklyStudyInteractor.getWiseSaying(wiseSaying: $wiseSaying) }
+        .onAppear {
+            permissions.request(permission: .localNotifications)
+            weeklyStudyInteractor.getWeekyStudy(studyRecords: $studyRecords)
+            weeklyStudyInteractor.getWiseSaying(wiseSaying: $wiseSaying)
+        }
         .onReceive(studySessionUpdated) { studySession = $0 }
     }
 }
diff --git a/HongikYeolgong2/Presentation/Root/InitialView.swift b/HongikYeolgong2/Presentation/Root/InitialView.swift
index f4aa646..d212781 100644
--- a/HongikYeolgong2/Presentation/Root/InitialView.swift
+++ b/HongikYeolgong2/Presentation/Root/InitialView.swift
@@ -14,23 +14,20 @@ struct InitialView: View {
     @State private var appLaunchState: AppState.AppLaunchState = .checkAuthentication
     
     var body: some View {
-        Group {
-            content
-                .onReceive(isAppLaunchStateUpdated) { appLaunchState = $0 }
-        }
-    }
-    
-    @ViewBuilder private var content: some View {
-        switch appLaunchState {
-        case .notAuthenticated:
-            OnboardingView()
-        case .authenticated:
-            MainTabView()
-        case .checkAuthentication:
-            SplashView()
-                .ignoresSafeArea(.all)
-                .onAppear(perform: appLaunchCompleted)
+        NavigationView {
+            switch appLaunchState {
+            case .notAuthenticated:
+                OnboardingView()                    
+            case .authenticated:
+                MainTabView()
+            case .checkAuthentication:
+                SplashView()
+                    .ignoresSafeArea(.all)
+                    .onAppear(perform: appLaunchCompleted)
+            }
         }
+        .navigationViewStyle(.stack)
+        .onReceive(isAppLaunchStateUpdated) { appLaunchState = $0 }
     }
 }
 
diff --git a/HongikYeolgong2/Presentation/Root/MainTabView.swift b/HongikYeolgong2/Presentation/Root/MainTabView.swift
index 14189c4..3b43f62 100644
--- a/HongikYeolgong2/Presentation/Root/MainTabView.swift
+++ b/HongikYeolgong2/Presentation/Root/MainTabView.swift
@@ -15,75 +15,59 @@ enum Tab: CaseIterable {
     
     var title: String {
         switch self {
-        case .home:
-            "홈"
-        case .record:
-            "기록"
-        case .ranking:
-            "랭킹"
-        case .setting:
-            "설정"
+        case .home: "홈"
+        case .record: "기록"
+        case .ranking: "랭킹"
+        case .setting: "설정"
         }
     }
     
     var iconName: String {
         switch self {
-        case .home:
-            "home"
-        case .record:
-            "calendar"
-        case .ranking:
-            "ranking"
-        case .setting:
-            "setting"
+        case .home: "home"
+        case .record: "calendar"
+        case .ranking: "ranking"
+        case .setting: "setting"
         }
     }
     
     var iconNameSelected: String {
         switch self {
-        case .home:
-            "homeSelected"
-        case .record:
-            "calendarSelected"
-        case .ranking:
-            "rankingSelected"
-        case .setting:
-            "settingSelected"
+        case .home: "homeSelected"
+        case .record: "calendarSelected"
+        case .ranking: "rankingSelected"
+        case .setting: "settingSelected"
         }
     }
 }
 
 struct MainTabView: View {
-    @State private var selectedTab: Tab = .home
-
+    @State private var currentTab: Tab = .home
+    
     var body: some View {
-        ZStack(alignment: .bottom) {
-            Color.dark.ignoresSafeArea(.all)
+        TabView(selection: $currentTab,
+                content:  {
+            HomeView()
+                .tag(Tab.home)
             
-            VStack(spacing: 0) {
-                Spacer()
-                switch selectedTab {
-                case .home:
-                    HomeView()
-                case .record:
-                    RecordView()
-                case .ranking:
-                    RankingView()
-                case .setting:
-                    SettingView()
-                }
-                Spacer()
-            }
-            .padding(.bottom, SafeAreaHelper.getTabBarHeight())
+            RecordView()
+                .tag(Tab.record)
             
-            TabBarView(selectedTab: $selectedTab)
+            RankingView()
+                .tag(Tab.ranking)
+            
+            SettingView()
+                .tag(Tab.setting)
+        })
+        .overlay(alignment: .bottom) {
+            TabBarView(currentTab: $currentTab)
         }
-        .edgesIgnoringSafeArea(.bottom)        
+        .edgesIgnoringSafeArea(.bottom)
     }
 }
 
 struct TabBarView: View {
-    @Binding var selectedTab: Tab
+    @Binding var currentTab: Tab
     
     var body: some View {
         VStack(spacing: 0) {
@@ -92,17 +76,17 @@ struct TabBarView: View {
                 
                 ForEach(Tab.allCases, id: \.hashValue) { tab in
                     VStack(spacing: 5.adjustToScreenHeight) {
-                        Image(tab == selectedTab ? tab.iconNameSelected : tab.iconName, bundle: nil)
+                        Image(tab == currentTab ? tab.iconNameSelected : tab.iconName, bundle: nil)
                         
                         Text(tab.title)
                             .font(.pretendard(size: 12, weight: .regular))
-                            .foregroundStyle(tab == selectedTab ? .gray100 : .gray300)
+                            .foregroundStyle(tab == currentTab ? .gray100 : .gray300)
                             .frame(height: 18.adjustToScreenHeight)
                     }
                     .frame(maxWidth: .infinity)
                     .contentShape(Rectangle())
                     .onTapGesture {
-                        selectedTab = tab
+                        currentTab = tab
                     }
                     
                     Spacer()
@@ -122,3 +106,4 @@ struct TabBarView: View {
 #Preview {
     MainTabView()
 }
+
diff --git a/HongikYeolgong2/Util/Extensions/URLRequest+.swift b/HongikYeolgong2/Util/Extensions/URLRequest+.swift
index f992fb4..9d92d79 100644
--- a/HongikYeolgong2/Util/Extensions/URLRequest+.swift
+++ b/HongikYeolgong2/Util/Extensions/URLRequest+.swift
@@ -11,7 +11,7 @@ import Foundation
 extension URLRequest {
     init(_ url: URL) {
         self.init(url: url)
-        let accessToken = KeyChainManager.readItem(key: .accessToken) ?? ""               
+        let accessToken = KeyChainManager.readItem(key: .accessToken) ?? ""          
         self.addValue("Bearer \(accessToken)", forHTTPHeaderField: "Authorization")
     }
 }