It's a symptom of converting PDFs to ebooks.
Dark mode is really for mono CRTs and OLED power saving. Needs more front ilght on eink, so try using regular mode and front light off.
I've seen three Sage models with other family members and we have two here. Your Sage experience doesn't match ours.
A Sage is 8″ so the front light needs nearly twice the power of a 6″ ereader, and "darkmode" needs higher brightness.
You've got poorly formatted ebooks.
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