Thank you! It has worked now, and I have done the steps you’ve recommended.
Embarrassingly enough, I may just have missed the cue that it can be edited. I re-applied the Twenty Twenty-Three theme and it was a clearer indicator that I could edit that line. After I re-activated Twenty Twenty-Four, I just had to type after clicking on the excerpt text box.
Appreciate the time to write a response. Cheers and happy new year!