A two-line change to /use/share/gpodder/UI/gtk/gpodder.ui to change two horizontal panes to vertical ones was all it took to make it fit perfectly on the #Librem5 screen. I love #FOSS.
If you want gpodder to integrate with Lollypop for playback, just go into Lollypop and add ~/gPodder/Downloads to Lollypop's list of music directories.