diff --git a/pytket/docs/changelog.rst b/pytket/docs/changelog.rst
index 66e1482c38..b49720e1b1 100644
--- a/pytket/docs/changelog.rst
+++ b/pytket/docs/changelog.rst
@@ -5,6 +5,7 @@ Changelog
 -------------------
 
 * Support Python 3.13.
+* Fix small default display screen for circuit renderer.
 
 1.33.1 (October 2024)
 ---------------------
diff --git a/pytket/docs/display.md b/pytket/docs/display.md
index e74f075494..2a4092c240 100644
--- a/pytket/docs/display.md
+++ b/pytket/docs/display.md
@@ -29,11 +29,12 @@ from pytket.circuit.display import get_circuit_renderer
 
 circuit_renderer = get_circuit_renderer() # Instantiate a circuit renderer
 circuit_renderer.set_render_options(zx_style=True) # Configure render options
-circuit_renderer.condense_c_bits = False # You can also set the properties on the instance directly
+circuit_renderer.config.render_options.condense_c_bits = False # You can also set the properties on the instance directly
+circuit_renderer.config.min_height = "300px" # Change the display height
 print("Render options:")
 print(circuit_renderer.get_render_options()) # View currently set render options
 
-circuit_renderer.min_height = "300px" # Change the display height
+circuit_renderer.save_render_options()  # Export current render options to the pytket config
 
 circ = Circuit(2,2) # Define Circuit
 circ.H(0).H(1).CX(0, 1).Rz(0.4, 1).CX(0, 1).H(0).H(1).measure_all()
diff --git a/pytket/pytket/circuit/display/__init__.py b/pytket/pytket/circuit/display/__init__.py
index 0841b5324a..38483197c0 100644
--- a/pytket/pytket/circuit/display/__init__.py
+++ b/pytket/pytket/circuit/display/__init__.py
@@ -127,9 +127,11 @@ class CircuitDisplayConfig(PytketExtConfig):
 
     @classmethod
     def from_extension_dict(cls, ext_dict: dict[str, Any]) -> "CircuitDisplayConfig":
+        min_h = ext_dict.get("min_height")
+        min_w = ext_dict.get("min_width")
         return CircuitDisplayConfig(
-            min_height=str(ext_dict.get("min_height")),
-            min_width=str(ext_dict.get("min_width")),
+            min_height=str(min_h) if min_h is not None else "400px",
+            min_width=str(min_w) if min_w is not None else "500px",
             orient=ext_dict.get("orient"),
             render_options=RenderOptions(
                 **(ext_dict["render_options"] if "render_options" in ext_dict else {})