Please note that it is not recommended to perform regular administration in the Control Panel as it can cause other sections of UMP to stop working.
There are times when a user need to be removed from the Control Panel (Liferay User) if the user needs to be removed or to fix issues with the user. In order to determine if this is a course of action you need to take, please consult the following documents and search for Liferay users. These go into more depth for what users are configured in UIM.
* Nimsoft User Types
* Nimsoft/UIM Users Explained