Would here be new visual indicators for marking the comics as read in library view? Maybe a different colored check marks you can customize or making the 100% comic display a black and white cover? Also different indicators for the progress bar.
While the minimalist look is good, it can be a little hard to manage comics when you have a large library on hand with the small thumbnails option.
Side note has reading time been eliminated? While it is is useless I usually feel pressure when seeing it after