When we need accessing remote server to develop software on Microsoft Visual Studio Code, SSH FS is really useful as far as I experienced, so you can manage files remotely just like your local hard disk. If you are in collaborative development using GitHub or BitBucket, you should not try this method, because you may able to spoil someone's source code that you haven't aware.

Followings are the simple steps

STEP 1. Menu → View → Command Palette → Type "install" and select "Extensions: Install Extensions"

STEP 2. type "SSH FS" and install "Remote - SSH"

STEP 3. Setup Host

Click  located on bottom left → Select "Remote - SSH: Connect to Host..."

 → "Add New SSH Host..." → type host information like below

STEP 4. Connect to the server

Click  on bottom left → Select "Remote - SSH: Connect to Host..." → Select the host you created → Click Explorer () → Open Folder

If everything is okay, you can see whole files as well as directories like below:

Enjoy your coding~