There is a new "feature" that pops up something that looks like a floating page thumbnail in the upper right corner of the document whenever I scroll with my mouse. Although there is a tiny X to close it, it's hard to get it to close and it doesn't stay closed. There doesn't appear to be any way to turn it off.

I'm not sure what the purpose of this feature is-- maybe it's useful for a touch screen (although I don't really see how), but it gets in the way when trying to read/edit an existing PDF. Specifically, when you open Find, the Find window opens in the exact same spot.

I would love for you to a) name this feature, and b) give the user the option to turn it off. It is totally useless when using a standard monitor/keyboard/mouse setup-- there are better ways to navigate a document.