Search Forum feature

I can't find how to set the playback tempo in MS-4.02. It says to undock the Playback window, but I can't find how to do that either. Why couldn't there be a "Search the Forum" feature, because there are nearly 1500 pages of Support to look through manually!! I'm sure it would be more useful than the "Search for Sheet Music" feature.
I was starting to learn Version 3 when Version 4 came out. So far I think in Version 3 it was easier to find things than in the new layout. I am considering going back to V3.