RV Interface on 4K display with very small buttons, where to set DPI for the UI?

Several years working with the web interface and recently installed RV to see how this can be used and I face a serious DPI issue with the interface. All buttons are soo small it makes it hardly useful. I’ve set the font size in preferences but this affected only the font size of the menu tabs and their contents. All buttons for the player, browser and etc are extremelly small.

How do I set a normal looking interface on a 4K display? Couldn’t find anything in the preferences about it.