Sorry, I didn't see this before now. Basically I want to be able to select all those checkboxes you see on the screenshot with one click. It's much quicker to select all then unselect a few than to have to check each box individually, especially if there are loads of them
This is in AdminCP>>Style Manager>>Expand Templates>>{Choose A Template}>>View History
If you do a lot of template editing, which I do, and save each time it can make that database table huge, so I delete old revisions every now and then.