#ADHD folks & #minimalism fans with overflowing #email inboxes (or some #GNOME devs with too many mailing lists & bug tracker emails) might be pleased to discover that @EvolutionGnome has a secret gsetting (that you can toggle in dconf-editor) to disable unread mail counts for folders in the sidebar: https://gitlab.gnome.org/GNOME/evolution/-/issues/971#note_1818656
Because what's the point of knowing you have 787 unread emails instead of 785, anyway? 
Wish I had per-folder notifications to go with that: https://gitlab.gnome.org/GNOME/evolution/-/issues/672