how to delete personal group

If I am understanding the requirement correctly, you wanted to remove access of personal groups from a workspace
If Yes, You can remove them from Workspace access list.

Please update if you need some other help.

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Hi Mr.

thanks for your quick response. 

the way works when the type is workspace, there is access button .

but when the type is personal group, there is no access button, that means I can not give or delete users' access.

Actually the request is not  solved, because the answers are all saying that the personal group can not be deleted.