A confusing widget on "Calculator " 's UI

[b450mhdv]

Hello , I enjoy using this app, it is very useful for me! However, I found a misleading widget in this app.
I thought "DEC|RAD" in the upper left corner was not clickable, but I was surprised to find that it actually toggles "RAD" mode and "DEG" mode. I think users may be confused when they activate it inadvertently, under the misconception that they are only used to show the state.
So, just as a personal suggestion, could you try to redesign the widget? And thanks for your useful app!

[navid-zamani]

I’m running 5.4, and it isn’t even visible at all, unless I use a trigonometric function.

In the same vein though, it is only possible to discover the secondary functions on the side or the history by accident. And the (+) button opens a bar to switch between modes, but does not show the current state (e.g. by highlighting that (borderless) “button), so it seems broken if you tap the one it already is in. As I assumed, tapping 2nd would get me cosin and the like. (Also, is there a 1st too? How do I see it?)

So in general, the UI is quite Apple-y. 😋
(Thanks Steve Jobs, for ruining computers!)

Going over every element and making sure it is clear

1. that it exists,
2. if it is interactable
3. what state it is in (e.g. darkened background behind 2nd
   without interacting with it first,
   the app could be quickly improved dramatically.