By clicking on it, users can manage or log out of their active account, and see a 'Help' page with various links to helpful resources.
The top left corner of the Minecraft Launcher contains the user's Xbox gamertag for the currently active account (which might differ from their Minecraft: Java Edition username). On the left side, a 'News' tab, a tab for each game, and the Minecraft Launcher 'Settings' tab can be seen. If a user attempts to log in with a Mojang Studios or legacy Minecraft account, they will be directed to migrate to a Microsoft account. Subsequent logins can be done in the 'Settings' tab. On the initial login screen, users must log in with a pre-existing Microsoft account, otherwise they can create a new one by clicking the link. 7 Uninstalling the old Minecraft Unified Launcher.
