Android
Delete a User Account auf Android
Android's multi-user feature keeps every added person in a separate profile with its own apps, accounts, and files, kept apart from your main account. Only the device owner or administrator can remove another user profile. A guest session behaves differently and clears itself automatically once you switch away from it, so it never shows up as a deletable user.
Removing a user is permanent. Once you confirm the action, all apps that person installed, their signed-in accounts, photos, and settings disappear from the device and cannot be restored afterward. Ask the other person to back up anything they still need before you go through with it.
To delete a user profile, go to Settings ➔ System ➔ Multiple users, select the user you want to remove, then tap Delete user and confirm with Delete.
If you only want to free up storage or fix a misbehaving profile without erasing the whole account, clearing that user's app data or cache first is usually a better first step than deleting the entire profile.