Black Box while screen share.

Hello,
when I host a Zoom meeting and start a screen share, the participants always see a black bar at the top. This is the zoom bar for me. Even if a pop-up window appears that another participant wants to join the meeting, the other participants see this as a black box. I've attached an image as an example. I've already looked through all the settings, updated the Zoom client, but I just can't get this to go away. I work on Windows 10 Pro. Can someone help or give a tip here? Thanks!