I've copied to my local drive a DOCX file that I was working on in Dropbox, and when I tried continuing work offline on the copy I made on my drive, Microsoft Word told me that the DOCX file has macros disabled because the source of the file is untrusted.
Microsoft Word referred me to this help page: https://support.microsoft.com/en-us/topic/a-potentially-dangerous-macro-has-been-blocked-0952faa0-37e7-4316-b61d-5b5ed6024216#bkmk_unblock
However, the file Properties does not display any Security section in the General tab so that I can Unblock it.
I also don't know how to add my Dropbox to the Trusted Sites.