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Workspace Owners and Admins can choose whether to let everyone (except guests) invite new members to your workspace. This lets members invite the right people to the workspace without making everyone an admin.
Note: With this option turned on, members still won’t be able to invite Single-Channel or Multi-Channel Guests. Guests can only be invited by Workspace Owners and Admins.
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.