Rebuild Mesh window not showing up

No matter what I do, I can have ‘rebuild mesh’ window open up. Rebooted the computer didn’t help either. I use dual monitors, so I also tried to activate only one monitor. In Command line, I see that “_RebuildMesh,” but I can’t edit anything because there’s no editing window showing up. Any ideas?
Version 6 SR28

Hello - RebuildMesh does not have a dialog, if that is what you are expecting. It just ‘does it’ See Help on this command, it is not really related to the Rebuild command in any way.

-Pascal

Maybe you mean to use MeshRepair?

I probably need sleep. What I was trying to do was, ‘reduce mesh.’

It drove me crazy that I couldn’t simplify unnecessarily heavy Sketchup objects. Thanks for your replies.