Hey @source2sea ,
I ran into the same issue before. The reason it shows "All workspace users โ Can Manage (inherited)" is because the permission is coming from the folder where your dashboard is saved.
To fix it, go to that folder, click on the three dots (โฎ) next to its name, and choose "Manage permissions". From there, you can either remove the "All workspace users" group or change their access level to Can View instead of Can Manage.
Once you update the folder permissions, the dashboard will stop inheriting those manage rights.
Hope this helps!
harisankar