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Some relevant additional user settings to mention are the ‘Debug access' and ‘Debug' settings. Obviously, these settings can be used for debugging purposes.
In both cases, this can be used by an admin user, when debugging certain issues a user is facing. Both options can be switched on for a specific user before the admin user switches to this user. Make sure to switch the option(s) off again after the debug is done.
Debug access: if this setting is enabled, the access log button becomes available on the top right corner of each screen. With this option, the access rights of all elements (functions, page functions, objects, page includes) currently shown on the screen can be evaluated.
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