I have tried editing the xml and adding in …

You cannot just add new structures in the UDL XML definition and hope that Notepad++ would just magically understand what you meant.

how do you do more than two folding code styles and one comment folding style

You can mix multiple fold structures of the same type in the same boxes.

Folding in Code 1 is meant for things that fold that don’t require spaces surrounding it – so the c-style { … } folding would be a primary use case for FiC1.

Folding in Code 2 is meant for things that fold that do require spaces, like words, so that it will fold on “if” but not “gif” or “iffy”. So if / else elsif / endif would be one such set.

Folding in Comments is intended as a way to add a prompt inside a comment that will do folding. for example, =begin and =end as FoldingInComment with comment prefix of #:

With multiple in the same box, like the if and switch constructs, you could technically trick N++ into doing folding on invalid combinations, like if / case / endswitch or switch / else / endif . So it’s imperfect, but N++ UDL isn’t meant as a code validator, and won’t enforce valid syntax.

But since most languages require fully nested, most combinations will fold the way you expect:

You will notice that I earlier had a space between the default and the :, because in FoldingInCode2, spaces are required. If you moved it over to FoldingInCode1, then you wouldn’t need that space: