Settings

Appearance

Color palette, six options: amber, indigo, emerald, rose, cyan, slate.
Window resolution, 1280x720, 1440x900 (marked recommended), 1600x900, or 1920x1080.
Reduce motion, turns off animated transitions for lower end machines.
Language, English, Vietnamese, Chinese, Japanese, Korean, German, French, or Spanish.

Default min and max RAM, used as the starting point whenever a new profile is created. Default max RAM is 4096 MB, capped by what your computer actually has.
Default JVM arguments, applied to new profiles alongside MCL's own built in optimization flags.
Auto Download Java, lets MCL fetch the Java version a profile needs when nothing installed is new enough, instead of asking you to install one yourself.

Launch behavior, what the launcher window does once the game starts: stay open, minimize, or hide until the game closes.
Discord Rich Presence, shows what you are playing on your Discord profile.
Auto update, checks for and installs new versions of MCL itself automatically.
Share My Skin, see Skin Studio for what this controls.

See Storage Cleanup for the dedicated cleanup tool, reachable from Settings.

Setup

Playing

Hosting

Reference