Font size is now constant 14.0f (this value comes from fluent theme resources, there is also a bug which blocks using the resource: it is double, but font size is float, probably a bug in Avalonia).

As noted in #121 (comment), this is also a problem for Platform Uno. The solution would be to change all float properties to double, but that change will be done in #121.

Also this value (14) would be great as the default across all platforms. The current default, 50, is definitely too large. I'll add a commit that implements this change.

I got System.InvalidOperationException: "The control already has a visual parent." while switching between themes.
Let's check whether it is an Avalonia bug or something on our side before merge

I think this is AvaloniaUI/Avalonia#4265.

To avoid crash I think it would be better to replace ComboBox here with ToggleSwitch or something like that

I tried to use ToggleSwitch but all my attempts are failed. Despite themes are replaced the toggle itself was remain on the same position. Unclear why.

Two RadioButton seems safest option :-)

I can do it in the evening if better solution won't be found.

Can the RadioButton text be vertically centered relative to the circles?