On the "edit current element" tab on your DesignPlus menu, select "content block." There are three small buttons just above the dropdown menu. This allows you to filter the content blocks you see.
1st icon: display your course-level content blocks.
2nd icon: display primary content blocks from our team
3rd icon: display content blocks from Cidilabs.
Deselect the second and third icons, so that just the course-level content blocks are visible.