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": "}}}"
        }
    }

}}}