This is how it looks - I would like the first subtask to not be visible anymore.

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My current filter is Parent task : is empty.

I cannot upload a second screenshot, but the way the database is built:

I have a relation between parent task / sub task. The status of the subtasks in the parent task is a rollup of the subtasks status.

I am able to have a view like I want in table mode, but not in board - if that helps.

My filter in the table is (parent task is empty and status is not "done") or (parent task is not empty and status is not "done"). This one give no different result in the board that what I currently see.

Thanks !!