In a DE and depending on the terminal emulator, one could probably set up a profile that uses variable-width fonts and switch to it for Lue. That experience would depend on how well it renders text, particularly typographical elements.
me, mainly i just look for the most beautiful monospace font i can find that has a nostalgic feel. recently my favourite has been "modeseven" (https://online-fonts.com/fonts/modeseven), which is also featured in the screenshot on the github page.
+ from rich import box
...
book_panel = Panel(
book_content,
+ box=box.SIMPLE_HEAD,
title=f"[{COLORS.PANEL_TITLE}]{progress_text}[/{COLORS.PANEL_TITLE}]",
...