Set Definition from Tempo - how do i reverse this?

I used the “Set Definition from tempo” for a section of my work, and accidentally selected some tracks (before and after the section in question) that should not have been included. Now, I can’t seem to reverse or unselect those tracks.

Can someone please help?

have you tried file restore to go back to a version of your project before things went wrong? I also belive there is an option in cubase to Revert.