Currently using plugins while running at a 4k resolution is a NIGHTMARE. Every plugin opens tiny, and resizing the plugin window doesn't increase the size of the plugin, it simply adds more grey around the plugin which is of absolutely ZERO value.

In Ableton, they resolve this issue by allowing the user to disable a HiDPI mode, allowing for plugins to open and function at level meant to be seen without the aid of a scanning electron microscope. Given that Adobe is a bigger and more sophisticated outfit, I can't see why you shouldn't be able to do something similar.

Here are two photos of the same plugin running on the same machine at the same screen resolution but first in Audition and then in Ableton. The only difference is that in Ableton they've allowed me to NOT have a hiDPI mode for the session.

Please fix this ASAP. This isn't rocket science.