We previously allowed all editors to edit pages. Now that we are using the advanced permissions, our editor has received full permission to edit all page related options. However, we don't want to let editors play around with permissions and therefore want to revoke this right. Carry out the following steps to make sure the editor can't mess around with permissions:
Go to the Dashboard by clicking on the button in the toolbar on top.
Click on Full Sitemap to open the sitemap.
Click on the Home page and then Set Permissions.
In the permissions dialog, click on Edit Permissions.
Click on the trash bin next to the Editors group.
Click on Save to confirm the change and close the dialog.
Click on Save once more to confirm and close the dialog.