When creating or editing a window, you have the ability to select tests individually or by their tags.
You can select both tests and tags at the same time to have better control.

Please do keep in mind the following: When selecting tests by their tags, it will apply the windows to these tests at the time of saving the window. Editing tags of tests afterwards will not automatically update your maintenance windows. Because of this, we advice to give your windows an update to ensure they apply to the correct tests.