An info manager with all rights is not able to edit another user's user preferences. If an info manager selects the user from the administration menu the preferences tab will not be visible.
Only a system administrator can edit another user's preferences, not even an info manager with all appropriate rights can.
This is a known issue and should be resolved in 7.3d.
As a workaround if you run the following SQL info managers will now be able to edit another user's user preferences (after a metadata refresh or iis reset):
update actionSecurity set acse_value = 1 where acse_action = 1670 or acse_action = 1672