Survey Groups is a pro feature that helps exclude workers for studies running simultaneously to make sure that one participant does not take multiple studies running at the same time.
Using the "exclude" function will not help for this because the include and exclude fields only work for workers or studies that have previously been approved or rejected.
To set up a Survey Group, you can go into the "pro features" tab in the design study setup and you should see an option to create a survey group. Add a survey group and create a name for it. Then, in your other study(s) you can go into the same "pro features" tab and select your created survey group and add that study to it. Any study in a given survey group can only be taken once while the participant who took it will automatically be excluded from all the other studies in that survey group. This would include studies in the same survey group that were run in the past as well.