Indesign UI renders over size on secondary monitor

[Momento Creative]

Hi there,

I have an unusual bug. My setup is a new 16" MBP M1, and I'm using an LG 5K monitor for my secondary screen. When I launch indesign, it will open up with a giant looking UI. Everything is massively scaled up. However, if i unplug my screen, quit indesign, then relaunch it just on the laptop screen, then reconnect the monitor, it will now look the correct size. This problem is independent of the new UI scaling tool, i've tried that. Besides, it's like comically big.

TL:DR I think when indesign is launching, its reading the dimensions of my laptop screen, then scaling it up to my larger secondary monitor.

[Eugene Tyson]

Why do you think that?

I've a 2012 Mac and a Dell 2nd monitor and some mornings when I boot up (not related to any other software) the UI on the 2nd screen is massive.

I reboot and it's back to normal. It doesn't bother me enough to look into it further.

It could be something to do with InDesign.

Have you contacted LG Support?