
Hi @IMK ,
Permissions for the default SharePoint groups (Owners, Members, and Visitors) for Team sites that are connected to a Microsoft 365 group can't be modified.
Therefore, we could not change the Members Group permissions from "Edit" to "Contribute".
The workaround is to remove users from the default Members group, create a new SharePoint group with contribute permission level then add users in the new SharePoint group.
As michev mentioned , we do not recommend changing the default "Edit" permission level.
Reference:
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