An incorrect site role can prevent you from changing your site's design, managing Site plans, or archiving sites, even though you own the Workspace. This can happen after someone transfers Workspace ownership to you or transfers a site into your Workspace and you have a site role other than Site manager.
Check your role in Site settings > Site access. If it isn't Site manager and you can't change it, contact Webflow Support to have your access reviewed.
Choose the affected Workspace and site in the Support Portal, and explain which action you can't complete. Mention whether the issue followed a Workspace ownership transfer or a site transfer.
After Support confirms your access has been updated, refresh the page and try the action again.