PHP Storm excluding folders from test source

I'm using phpunit to run tests in phpstorm. The tests source folder has been set that when right clicking the folder, phpstorm runs all the tests in that folder. However there is one folder of tests that I don't want to run when right clicking "run tests". I've removed that folder from the testsuite in the phpunit.xml so that it doesn't run specific tests from the terminal, however they still run when right clicking on the folder.

Is there any way to exclude a folder from the test sources in php storm or is it simply not possible?

Thanks