[GrannyGrump]

@RSoldin -- You might consider using the Sigil option "Open With" to open your html files in a 3rd-party text editor. I happen to use Notepad ++ (free, opensource), partly because it does highlight matching tags and does a lot of other configurable semantic code highlighting. I do a lot of editing in NP++, save there, and return to the Sigil app --- those files will have been updated in Sigil, and all I have to do is save the Sigil file.

(I have a vision problem with depth perception that makes the indentations very difficult to track.)

Please forgive if this is a bit too elementary for the subject...