To scale the font size of Spotify on Linux, open a terminal window and enter the following command.
$ spotify --force-device-scale-factor=1.5 <enter>
You will find that spotify menus are now bigger and more readable.
To make them scale permanently whenever Spotify starts, create a desktop shortcut and put the scaling factor in the desktop file.
$ sudo vi /usr/share/applications/spotify.desktop <enter>
Exec=spotify --force-device-scale-factor=1.5
:wq
This makes it scale the fonts in Spotify when Spotify is started.
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