In the Options > User Interface > Ease of Access settings, there is a drop down to change interface scaling.
Currently the options only allow you to scale up for accessibility.
I would be useful to have a way to scale the interface down.
This is useful for people who switch between high resolution monitors (4-5k) and regular HD monitors (or smaller).
Screen real estate is always at a premium. I imagine it should be relatively simple to add some additional options to the drop down menu.