I'm not sure if this is a Beta thing or a setting or something else but today when using DeX when my phone display goes off then so does DeX. This happens even if I'm mid message in DeX. In DeX I have "Prevent computer screen off. Keep screen on when DeX is running' on. Any other settings it could be?
This is a screen shot from within connected devices and its all greyed out. When DeX isn't connected you don't see the options so how do you ever change them??