Problems with multiple monitors on MAC Pro 2015

[junias]

Hi there,

I have two big problems with multiple monitors on my MAC Pro 2015.

System:
- MAC Pro 2015
- OBS 27.2.4
- MAC OS 10.15.7
- 3 monitors (internal MAC Monitor, 1 HDMI Monitor, 1 DisplayPort Monitor

Expected Setup:
- OBS Main View on internal MAC Monitor
- OBS Multiview on HDMI Monitor
- OBS Program Preview on DisplayPort Monitor

Problems:
- If I select "Multiview - Fullscreen" - no matter which monitor I select - OBS always shows the Multiscreen on the internal MAC Monitor. Furthermore, I cannot switch back to "normal" OBS Main View (just one OBS Icon). Both other displays are black. When I quit the Multiview (ESC), then the other monitors got normal again (no black anymore) and I can use the OBS Main View again
- Same behavior with the Preview from Program. If I select the Preview - no matter which monitor I select - OBS alwas shows the Preview on the internal MAC Monitor and the others got black.

I can use all three monitors "normally" when I dont use it with OBS Preview / Multiview.

Any ideas / help?

 

[junias]

No one with any suggestion / idea?
Updated MAC OS to MAC OS 11 Big Sur and reinstalled OBS with new settings.

Problem still the same :/

 

[junias]

Ps.: There is a little bug in the description above: Its a MAC Book Pro 2013 with Nvidia 750m graphics card...