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By default, only Workspace Owners and Admins can add new members to a workspace, but they can allow members to do so as well, if they'd like. Changing this permission gives members the ability to add new people, but won't change their role to an Admin.
Note: Only Workspace Owners and Admins can invite guests, even with this option turned on.
Set who can send invitations
From your desktop, click your workspace name in the top left.
Select Administration, then Workspace settings from the menu.
Click the Permissions tab.
Next to Invitations, click Expand.
Check the box next to Allow everyone (except guests) to invite new members.