Is a Theia-created IDE supposed to be keyboard-operable?

I ask because I’m having some difficulties. E.g. In Theia Browser Example, I can’t find a key to open the File menu. On Help About I can’t find a key to scroll the list. On Keyboard Shortcuts, I can’t find a key to select the item edit (ENTER edits the first on the list despite that it is not visibly selected).

[original thread by chrisjj]

[chrisjj]

Posted at https://github.com/eclipse-theia/theia/issues/7047 .