Hi @Anonymous
Per my test, I could set the read-only permission through: select the page > Manage access > Advanced(at the bottom of the box) > stop inheriting >grant new permissions ( for example I grant read-only permission to luyi)
As a result, the account(luyi) can’t edit the plan.
You could check the permission of the page: Manage access > advanced > check permissions ( in my case, luyi has been granted read-only permission correctly)
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