Hello everyone! Does anybody know how to use notepad++ on hosting using the ssh protocol,

The plugin NppFTP has the ability to make FTP or FTPS or SFTP (the last of which uses the SSH protocol for doing file transfers), to allow you to edit remote files in Notepad++.

in order to edit all files on the server at once without downloading them to computer?

Technically, that won’t happen; in order to be able to use an app on your local machine (ie, Notepad++) to edit a file on a remote machine (at the other end of the SSH/SFTP link), the bytes for the file must come over the network to be at least temporarily on your local machine; the NppFTP plugin will keep a local cache of the remote files, which is technically what is being edited, but every time you save in Notepad++, the NppFTP plugin sends the data back to the remote machine, via SFTP.