If you're using Loupedeck, then the overlay is likely coming from the Loupedeck software, not MIDI2LR. You can verify that by:
1. Do File > Plug-in Manager, find the Loupedeck plugin in the left column, and select it.
2. In the Status panel on the right, click Disable.
3. Restart LR.
Loupedeck will be temporarily disabled for LR. Do you now see the overlays when you click on a tool? If you don't see the overlays, you've confirmed they are coming from Loupedeck, and you'll have to contact Loupedeck support for you might disable them. Don't forget to re-enable the Loupedeck plugin.