Hi @Jennifer Healy,
You can set permissions on a folder individually by following these steps:
1.Select the folder and right click->manage access.
2.Advanced Settings.
3.Stop inheriting Permissions.
4.You can grant Permissions to users or groups.
Or selecting a group and change their permissions. (If you remove a user's permissions, that user is prohibited from accessing the folder.)
You can follow this article to get more information about Permissions.
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