When you configure the Limit profile size policy at
User Configuration\Administrative Templates\System\Logon/Logoff and configure a Custom Message, you can NOT see the entire message in the GUI?
The GUI will display a maximum of 43 characters.
To view the Custom Message, after the policy has been applied, use the Registry Editor to navigate to HKEY_Current_User\Software\Microsoft\Windows\CurrentVersion\Policies\System. Double-click the ProfileQuotaMessage Value Name, a string (REG_SZ) data type.
NOTE: If your Custom Message exceeds 500 characters, the default message is used:
You have exceeded your profile storage space. Before you can log off, you need to move some items from your profile to the network or local storage.