Add a visible "off" state to segmented controls

I was having trouble figuring out, how to reset the capitalization-transform in the text-panel. In the current design the user has to toggle the currently active transform to disable it. However this breaks the convention with the neighboring controls where there is always one active item.
In other Apps like Figma (see screenshot below) this is solved by having a visible “off”-option. It might be worth considering whether to add such an option to the capitalization and underline/strikethrough panels.