Implement the behavior for OneNote Online.
I am aware of that when dragging and dropping to move the section, the function does not work at all on OneNote Online. Also, when I synchronize the files with the other clients, the same event has been occurred, then where the order of sections is switched in the files. I cannot find any workaround except the situations allowed me to sign up on the client's account. I assume there is no solutions so far even I tried a troubleshooting to figure out.
I really hope this behavior will be fixed fundamentally and Improved usabilities for OneNote Online.