This is a list of issues we've found when trying to navigate the Settings UI using only the keyboard:

• On Color Schemes edit page (with a custom scheme open so it's editable) use the tab key to navigate between controls. Press Tab from +AddNew and it will go select nothingness. One more tab will select the Black box. It should probably never select nothingness.
  • It also selects nothingness between Bright White and Foreground. Bright White (Tab) Nothingness (Tab) Foreground.
• On all pages, it appears that once you tab all the way to Apply in the bottom right corner… you get stuck. I think tab navigation is supposed to be fully circular (going back to the first thing or the most Shift+Tabby thing) and around again.
• Open SUI. Switch to a TerminalTab. Invoke "open Settings UI" kbd again. Hamburger menu focused.
  • Expected: highlight last highlighted setting

Potentially upstream issues:

• tab navigation when in left bar...
  • updates header, but not frame
• individual radio buttons cannot be selected via keyboard (See RadioButtons control does not support keyboard navigation in XAML islands microsoft-ui-xaml#3156)
• pressing letter key in a combobox does not navigate to first combobox starting with that letter