Arcane doesn’t have an option to include a featured image with the excerpts, and that isn’t something you can easily do with CSS.
If you need featured images displayed on the blog page, you might be better off choosing a theme that offers that ability. If you’d like any assistance choosing another theme, just let me know.
Another possibility would be to use the Display Posts shortcode on a static page and set your front page to that page. You would need to use CSS to style the shortcode output so that it looks more like what you have now, but it’s a possibility you might like to explore. You could set up a test page (not linked to from anywhere, or set to draft) to experiment, if you wanted.
Thank you for your response. I’ve experimented with so many other themes and I just don’t like any of them as much as this one. I like everything else about Arcane except the front page posts (not including images). I’ll play around with shortcode and see if it’s something that could work. Thank you again very much!