my acr set up doesnt work

[SaT_Admin]

Yes that is likely the problem. You have 2 options to try. First, you can try to override scaling for the ACR application specifically, or Second, you can make your external monitor 150% also. See this link:

https://www.stackandtile.com/sat/help/wi...caling-fix

Let me know what you choose and if it works