Remove licences by clicking on them in the window on the left and then clicking on the Remove>> button. You can also use double clicking and selecting more than one licence by holding down the Shift or Ctrl keys while highlighting licences.
You may remove a licence which is a prerequisite for other licences (in this example, you must have a licence for EdgeCAM Milling to be able to use a licence for VDA-FS Interface):

When you try to remove the licence, the following dialog is displayed:

In the example, the dialog says that if you remove the EdgeCAM
Milling option, you will also lose the VDA-FS
Interface option.
Click on the Proceed button to remove the options. Click on the Cancel button to avoid removing the licences.