If you have a xps9360 like I do, then your beautiful UHD screen is wonderful. What’s not wonderful is how some applications don’t place nice. If you have problems with Spotify being unreadble …. try this:

$> spotify --force-device-scale-factor=1.5

https://community.spotify.com/t5/Desktop-Linux-Windows-Web-Player/Linux-client-barely-usable-on-HiDPI-displays/td-p/1067272