If you have tests definitions and tests which are no longer useful, you can hide them so they will no longer appear on any of the scheduled lists or the outputs.
In the sheet button of the main KeyLAB ribbon, double click on the test definition you want to hide. In the main dialog you will see a hidden check box. When you check the hidden check box it will result in that test definition and the sheet related to it hidden.
If there are tests related to this test definition they will no longer be available in the test button. It’s important to make sure that there are no active projects using that test definition.