Mac storage basics · Apps and macOS itself
Does deleting an app from Launchpad uninstall it?
Short answer: For App Store apps, yes — hold an icon until it jiggles and click the X. Other apps must be moved to the Trash from Applications; Library leftovers usually remain.
For apps from the App Store, yes: in Launchpad, press and hold an icon until it jiggles, then click the X to delete the app. Apps installed from elsewhere don't show an X there; move those to the Trash from Applications instead.
Either way, settings and caches the app created in your Library usually stay behind.