Teamviewer 12 on Raspbian 9 (stretch) - showing preview banner
[removed per Community Guidelines]
Installed are two TV versions 12 each, since a commercial license exists here, on a Pi with OS version 9 and a Pi with OS version 10 (buster).
On the PI with version 9 is constantly a banner with preview to see. A stable version was installed and this was also fixed via <<teamviewer repo tv12 stable>>.
In contrast, on the Pi with Raspian 10 (buster) everything is displayed correctly .
What can I do to make the banner with preview disappear? Are there OS versions of Raspian that are not compatible with Teamviewer version 12?