Hi Black screen of the remote computer will turn black during the session

According to the Internet page, it is possible that the screen is
black https://www.teamviewer.com/de/features/ Turn off the screen of the remote computer during the
session if you do not want someone to let you in on the remote computer.My question we pay about 1000 Euro each year to
Teamviewer license costsfor Premium Version.Why is TeamViewer not important to certain functions.stop working.

Greeting Sepp