It was a simple process to change the scaling of text/icons with 2012 RDP users by going to Display Settings and changing the scaling from 100% to 150%.
Can't seem to get there with Windows 2019. User is on Windows 7 so they are using an older RDP client. When you go to Display settings in their session it says Display settings can't be changed in an RDP session and everything is grayed out. Even when you hit Advanced the scaling is grayed out.