From our conversations I would like to list some steps, you can follow to move your Dropbox files away from OneDrive:
Sign in to your OneDrive account and locate the Dropbox folder.
Select all the files in the Dropbox folder, then right-click and choose "Copy" or (Ctrl+C), which you can also use the move option if you tech savvy.
Navigate to the new location where you want to move the Dropbox files to, I would recommend that you use Documents
Right-click in the new location and choose "Paste" or (Ctrl+V).
This might take some time, but you will see a display of your files being moved to the new location.
Once the files have finished copying, you can delete the Dropbox folder from your OneDrive account. Right-click on the folder and choose "Delete" or use the keyboard shortcut (Shift+Delete).
Note: If you have Dropbox installed on your computer, you will need to make sure that the Dropbox folder is also moved to the new location on your computer. This will ensure that any new files added to your Dropbox folder are synced to the correct location
I hope this help clarifies in detail what needs to be done. so that your Dropbox folder can remain the same.