My Mac mini with M1 doesn't remember the standard display orientation, it always rotates itself to 90 degrees.
You need to tell us the display model or at least, exactly what inputs the Samsung Display has.
At this point, I would try a straight cable connection without the adapter.
"HDMI to HDMI" using an HDMI cable or a
"USB-C to USB-C" if the display support USB-C input
What display and how is it connected to the Mac Mini?
(display brand and model, USB-C or HDMI, adapters and cables)
When does it rotate?
(wake, restart, turning the display off/on or after disconnecting and reconnecting the display)
FWIW Mac's can sleep 24/7, try sleeping the Mac Mini and only letting the display go into standby mode.
Hey, thanks for your response! It’s a Samsung (not sure with model right now) connected using USB-C Apple dongel (USB-C -> HDMI, USB 3.0, USB-C)
Rotates after I sign out, or turn off the Mac.
Mac mini doesn't remember external display orientation
