IMO more the other way around: If you have a Box in a DeMilitarized Zone, accessing that server from both sides only via FTP is safer than having HTTPS server there as well.

If you need to have HTTPS server running, yes probably minimally safer if disabled FTP(S) as there is HTTP get and set for files - dunno how much is mapped to identical OS routines in deeper OS levels.

If the box is not seen from the Internet, trust your security (famous last words, I know)

>I am enabling IIS on a Windows 10 computer. When adding Internet Information Services I have the branch FTP Server which consists of FTP Extensibility and FTP Service.
>I am trying to decide if I need these on my Windows 10. I will use this PC for developing and testing ASP.NET app.
>I read online that FTP server is used for uploading and downloading from anywhere to your computer.
>But could this cause a security breach too?