Thanks for responding. Actually that’s one of the first problems. I have no idea how custom-editor-style.css is supposed to be modified within pinegrow. Until now, I’ve been editing it outside of pinegrow, but whenever I select ‘export theme’ from the ‘WordPress’ menu to generate my css it overwrites the local version of custom-editor-style.css and moves it to the theme directory.
installed the ST2 theme with bootstrap and sass all setup. followed all the setup instructions, except I was already running apache, so I didn’t install local.app. so I have PGWPBootstrap4StarterTheme-master/ from which I do all my html/sass editing, then I export to my theme directory.
This was working great until I couldn’t get some of the WP smart components to work properly, so I’ve switched over to building my content in Gutenberg, making the editor styling much more important.