I'm sorry you are running into this issue but would really like to get this resolved for you!
To clarify, the issue seems to be that when you click on an item in your Favorites the Favorites menu collapses instead of staying open. Is that correct?
If so, could you please clarify what Layout you are currently using? We have three available, and you can check which one you are on by clicking on the cog icon on the top left of the screen and selecting Layout size & style.