I think there's some confusion around what users vs editors can do.
Editors can create blocks and the blocks appear on the editors list (bug fix for this case). Editors cannot create pages.
Users can't create blocks or pages. Depending on the permissions they might be editable.
To remove a block/page from a user, the group should be edited. So the process is
- login as administrator
- open the settings page
- click on "extend tab"
- click on "manage user group list" button on the user list area
- click on the group name to open the edit pane
- adjust the radio buttons as needed
There has been a fix though for Editors which will be out in 5.3.3:
- Fix for editor adding blocks now adds the block to the editor block ACL list