Admins can configure Invitation permissions for a team and restrict the ability of non-admin users to invite new members and change the account size. Go to Team settings > Permissions and scroll down to Invitation settings. The setting looks different on different Miro plans.
On Free, Team, Education plans, you can also enable or disable the team invite link which allows users to join your team by following a special link that can be copied on boards' Share and Invitation modal.
Invitation settings on Team plan
On Consultant, Business, and Enterprise plans, Company Admins can allow or forbid non-team collaborators.
Invitation settings on Consultant plan
Consultant and Enterprise plan Company Admins can configure invitation settings for each team within the subscription.