Prohibit page editing
By default, all users who have access to a page can edit it. You can make the page read-only if you are the page's owner:
Open the page.
In the upper-right corner of the page, click Action and go to Settings.
In the Page Settings window, enable Only the author can edit the page. Users who have access to the page will be able to view it. However, they won't be able to edit the page.
The organization admin can edit the page even if the page owner restricted editing access.
To disable comments on the page, click the Comments line, select Disabled, and click Save.