I have a few large collections. As far as I've been able to figure out if I want to remove an item from some of the collections it's in I have to open each collection in another window (so I don't forget what item I'm looking for), scroll down until I find it (text search doesn't work because the page doesn't load all items until scrolled), and then click to remove it. Am I missing a easier way to do this?

It would be really nice to have little Xs next to the collections in the "Add To Collections" pop up I could click to remove the item from them.

Where is this "remove" button people are talking about? all I can find are buttons to add it to another collection.