### Godot version

Godot 4.0 RC1 

### System information

MacOS Ventura 13.2

### Issue description

When in the "Text Editor" Help section and trying to change either the:

* Help Font Size
* Help Source Font Size
* Help Title Font Size

Changing the font size has zero effect on the font size.

See below example where "Help Font Size" is 40 however this does not reflect in the godot docs.

<img width="1259" alt="image" src="https://user-images.githubusercontent.com/8476589/218257090-04d14178-a9b7-4c3b-95e4-cb9a99f7f022.png">


### Steps to reproduce

1. Open Editor Settings
2. Click on "Help" within the "Text Editor" section
3. Change the font sizes (Help Font Size, Source Font Size, Title font size)
4. Close the editor settings
5. Observe that changes to the font size had no effect on the font size within the editor godot docs text.

Even restarting Godot has no effect on the font size within Help.

### Minimal reproduction project

N/A
GDCLASS(FindBar, HBoxContainer);
	LineEdit *search_text = nullptr;
	Button *find_prev = nullptr;
	Button *find_next = nullptr;
	Label *matches_label = nullptr;
	TextureButton *hide_button = nullptr;
	String prev_search;
	RichTextLabel *rich_text_label = nullptr;
	int results_count = 0;
	void _hide_bar();
	void _search_text_changed(const String &p_text);
	void _search_text_submitted(const String &p_text);
	void _update_results_count();
	void _update_matches_label();
protected:
	void _notification(int p_what);
	virtual void unhandled_input(const Ref<InputEvent> &p_event) override;
	bool _search(bool p_search_previous = false);
public:
	void set_rich_text_label(RichTextLabel *p_rich_text_label);
	void popup_search();
	bool search_prev();
	bool search_next();
	FindBar();
};
class EditorHelp : public VBoxContainer {