Undo:

[F�bio Campos]

Guys, i'm doing a photo event almost 2k. In the last i collected a color and not vi that was with the whole event selected. Dei ctrl z to undo but stuck in all photos and do not undo..  

[GoldingD]

I do not understand any of that.

[Sean McCormack]

I gather that you've done something to everything, but I've no idea what. 

If it's a setting and you had AutoSync on, you may have to step back a lot of steps to get it. Otherwise, go back to Develop with them selected and AutoSync on, and reset the setting you want changed. 

Other than that, we need a clearer explanation as @GoldingD has said.