One Day I got on my TV and there was no focus bar (the border around your selected option). The words that would be highlighted just are black words with no borders around them. I have no idea how to fix it and looked through all the settings to see if my kids might have you he'd something. It I couldn't find anything.
June 2020, and one day the same thing began on my TVs that have Roku Express+ (but not yet on my Sanyo or TCL Roku TVs). The actual channels have focus bars while using them, but not the Roku home screen.