Comment by r-spaghetti

in vscodium I have a different left bar color for each project - not exactly what you want but I can easily differentiate between them. There is a workspace settings json file per project: "settings": { "workbench.colorCustomizations": { "activityBar.background": "#faf7c7", "activityBar.foreground": "#000000" } } (disclaimer: this works on Debian Gnome)