ISSM uses code folding using vim markers throughout the code. Here are the steps to allow for code folding using VS Code if you don't want to use vim

Step 1

Find the ”Explicit Folding” extension in the extension marketplace and install it.

Step 2

This is also mentioned in the description of the extension, but to summarize:

• Go into settings
• search for the setting “showFoldingControls”
• set it to “always” if it is not already
• Then check “foldingStrategy” is not as defined “indentation”.

Step 3

Search for “explicitFolding.rules” and press “Edit in settings.json” or simply open your settings.json and add:

"explicitFolding.rules": {
        "*": {
            "begin": "{{{",
            "end": "}}}"
        }
    }