Could you please clarify if you're referring to Paper's tables and an option to freeze panes within those? If that's indeed the case, this is not possible at the moment; I'll make sure to pass your suggestion to the team though.
If you were referring to Excel Online, the functionality should be the same as in your native Excel application where you're able to do this from the 'View Tab' and clicking on the 'Freeze panes' option.
It goes without saying that if you're working on files within your Dropbox Folder natively on your Mac, you'd get prompted to edit them with Excel in the first place (or your preferred software) and see the same options as opening any other files from your computer (as your Dropbox Folder is a normal folder on your computer only with syncing capabilities).
I hope this helped to some extent and please let me know if you have any questions.
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