No screen saver on external monitors

[albuswhite]

Hi together,

I have a Kensington dock on my Mac 15" with M2 chip and have Mac OS Sonoma Public Beta installed. The Mac is folded up on the desk and connected via USB C.

Whenever I lock the Mac and activate the screen saver, the two connected Acer monitors turn off or go into power saving mode. I would like to run the screen saver from the Mac on both monitors. How can I set this?

Many greetings
Gordian