Just venting...and really wishing this feature existed.
I selected a Bible chapter I was working on, then tried to use some Logos tools...but while typing "Jeremiah" into one of them something went wrong after typing "J" and windows' focus left that tool...but I was still typing, so Logos dutifully applied my keyboard shortcuts for Highlighting to the selected text.
And now, instead of having this:

I have this:

And it will take me about an hour--based on experience--to rebuild my highlighting.
Luckily for me, my tablet was off-line at the time and I can use it as an offline reference to manually rebuild what I had.
Still, ARGH!!!! Really wish there was a Highlighting Undo! Please help me out; cast your vote at UserVoice.