I have the new M3 Macbook Pro. I've tried everything possible to be able to use my old 2015 macbook pro as an external monitor. The old mac does not pop up when I go to the display settings on my new mac (conversly, the new mac pops up when i go to the display settings on my old mac but this is not what i need). I also bought a traditional HDMI and a Type C HDMI cord. Neither has helped.
The old mac also does not pop up when i go to screen share on the new mac (but it pops up on the old one). IDK what is the issue. Both laptops are updated. Can anoyone help me please?