There's not a perfect solution. The best I can suggest is to switch to List view (icon at upper right) which shows smaller thumbnails. Also, dock CC Libraries to the left of your main dock. That way you can extend it as deep as you need to, and as wide as you need to (for example, to look at Adobe Stock photo displays):
-- what about sorting by name in the libraries in the pull down menu?
-- Can you separate all the libraries out of the pull down menu?
Thanks for your help.