When using a high DPI display (eg. a 4k laptop screen), the Spotify Snap may be unusable due to size (fonts very difficult to read). To fix this a scale option needs to be set.
Edit the desktop file: ~/.local/share/applications/com.spotify.Client.desktop. Add the --force-device-scale-factor=1.5 option after spotify (line 7):
Before changes:
[Desktop Entry]
Type=Application
Name=Spotify
GenericName=Online music streaming service
Comment=Access all of your favorite music
Icon=com.spotify.Client
Exec=/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=spotify --file-forwarding com.spotify.Client spotify @@u %U @@
Terminal=false
MimeType=x-scheme-handler/spotify;
Categories=Audio;Music;AudioVideo;
Keywords=Music;Player;Streaming;Online;
StartupWMClass=Spotify
X-GNOME-UsesNotifications=true
X-Flatpak-Tags=proprietary;
X-Flatpak=com.spotify.Client
After changes:
[Desktop Entry]
Type=Application
Name=Spotify
GenericName=Online music streaming service
Comment=Access all of your favorite music
Icon=com.spotify.Client
Exec=/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=spotify --file-forwarding com.spotify.Client spotify --force-device-scale-factor=1.5 @@u %U @@
Terminal=false
MimeType=x-scheme-handler/spotify;
Categories=Audio;Music;AudioVideo;
Keywords=Music;Player;Streaming;Online;
StartupWMClass=Spotify
X-GNOME-UsesNotifications=true
X-Flatpak-Tags=proprietary;
X-Flatpak=com.spotify.Client
As a temporary work around you can also use the hot keys Control + and Control - to increase/decrease scale.