That looks like the Flexible sections format.
I think clicking the up-down arrow (above "on" in Lesson) will enable move mode, with boxes in all the places you can move the section; click the one after the Unit 5 text.
I think clicking the up-down arrow (above "on" in Lesson) will enable move mode, with boxes in all the places you can move the section; click the one after the Unit 5 text.