I accidentally did sometime and now the text and video overlay tracks have turned gray and the text video overlays that I added no longer show in the Video preview window. How do I undo this.
It is something that is saved with the project. If nothing else, I'll scrap the project and start over
You have either muted those tracks, or soloed the ones that aren't grey. The solo button is the exclamation ! point in the track header. Clicking these turn "off" all the tracks that aren't soloed. The mute button is the one to the left of the solo button, which turns "off" the track.
So, make sure you don't have any mute or solo buttons engaged.