In order to manage your test suites - you may add new test cases or remove old ones from the suite itself - here’s how:
Select the suite you wish to work on by clicking it in the left panel
Click on the cases tab
Click on ‘Add case’ button above the cases list.
Tick the cases from the folders you wish to add to your suite from the list.
Confirm .
Click on ‘Save changes’ on the top right.
Select the suite you wish to work on by clicking it in the left panel
Click on the cases tab
From the list of cases in the suite - you may click on ‘Remove’ button for each case in the list.
Click on ‘Save changes’ on the top right.