On my Windows PC, I modify my Spotify client with Spicetify. Specifically, I use the Full App Display extension to simply display the album art, artist, and song title on my second monitor. However, my second monitor is a portrait-oriented 1080x1920 display. Sometimes I would like to arrange Spotify on one quadrant of this screen, but the desktop client has a minimum width of ~800px for me.
I finally found a way to bypass this limit, courtesy of maxawake on the Spotify Community forums. All I had to do is launch spotify with an obscure flag:
spotify --force-device-scale-factor=0.5This works on both Windows and Linux for me. Though on Linux (sway), the minimum size is only enforced in floating mode; tiling mode seems to override it.