S5: How to edit Multiwindow apps panel??

[mcefalu]

I have an S5 with the Multiwindow feature turned on. I would like to remove some of the apps on the app panel to make room to add calendar. I can't get anything to happen after I click the edit button. I tried long press on the app, thinking it would dislodge from the panel and I could drag it to the holding window on the right to get rid of it..but no luck. Any tips for me? Thanks very much.