I could have made a new thread, but since this thread is on a similar issue then maybe just adding it here is okay. If I can connect this 2nd monitor then I will explore those possibilities. moved onto a 2nd monitor while the main monitor has only the photo.

Also, I have heard, that Lightroom can have side bars, etc. There are always a few things that it would be nice to have in view, but they are usually behind Lightroom. I was wondering if connecting it to the HDMI port on the USB hub would work? I suppose if it does I could use the iMac as my main screen for photo editing, etc., but I could move other stuff off to the 2nd screen. I have never used a 2 monitor setup before with Windows, but many people do. I have an old 21.5' 1920x1080 monitor packed away and I started thinking that I could probably fit it and the iMac on my computer table. The mini display port to HDMI adaptor will allow you to connect a high definition monitor, projector or LCD TV to a MacBook, MacBook Pro or a MacBook Air. I will give it a try and let you know what happens. My guess is that this hub consumes the DisplayPort signal and uses it to offer a HDMI port. It will give me an HDMI port, an SD card reader, and several USB-A ports. The 24' M1 iMac can drive 'one external display with up to 6K resolution at 60Hz' using USB-C (DisplayPort) or Thunderbolt. This looks like it is the same one on Amazon Japan: Somewhere (maybe on this forum) someone recommended this USB hub on Amazon: While waiting I am continuing my research. Slow to get the 16gb model here in Japan. The M1 iMac 16gb/512gb that I ordered last week should arrive in another week or two. I used a search engine searching for info on how to connect an extra monitor to an M1 iMac and it found this old thread.

Macbook pro mini displayport to hdmi