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After defining a homepage for a user, there is no option to clear the value. The homepage for a user can only be a defined page and not 'unset'.
원인
Current there's no a way to do that through UI. Generally speaking there should always be a home page, if it's "unset", the default page would be used.
해결 방안
This can be done through a Groovy Script.
From the Navigation Panel, open: Administration | Tooling | Script Console
In the bottom panel, select the Scripts tab
Click the Add button.
Paste the Groovy script attached to the case
Replace the username test1 with the username to be unset.