Can't hide or delete purchased apps in iTunes/Mac App Store using latest Yosemite OS

I just updated my iMAC to OS X Yosemite in hopes it would correct my inability to hide purchased apps in iTunes. It did not fix the problem. I have read the support forums and have tried everything, including hover the mouse over and looking for an "x" in the left corner, and also placing the mouse in the same left corner and clicking as if there was an "x" present. Neither work. The only option I have when bringing up the purchased apps is the iCloud icon on the right side, which when clicked, requires me to log-in with my Apple I.D. and it then downloads the app once I sign-in. Where it downloads, I'm not sure. Ideally, I would like to delete certain apps, which I understand for some reason Apple doesn't allow, but at a minimum, I want to hide them. Any suggestions? Thanks.