I've seen that on mine also. I wish I could recall the exact steps I took to get rid of it. I suggest you completely close all dockers. Restart Draw holding down f8 and check yes to default. If you have a customized workspace, make a backup copy first to reinstall later.

Once you have the default workspace, use Windows/Dockers to open the Object Manager docker. It should open on the right with a full window. Be sure to unexpand it before opening the next docker. Let me know if this works.