To remove or unlink test suites to a test case version, navigate to the specific version of the test case. On the left side vertical menu of the test case details window, click on the icon. Then click on the menu icon for the specific test suite you want to unlink and choose Remove.
Alternatively, you may also unlink a test case from a test suite in the Test Suites sub tab under the Test Coverage main tab. Navigate to the test suites details window, then click on the menu icon for the specific test case you want to unlink and choose Remove.
Users will need view and edit permissions for test coverage to perform this action. Depending on the settings of a user's project permissions, they may be able to view all test cases and test suites or just a subset of both.