Configure Evince to open maximized with 100% zoom level?

Check

gsettings get org.gnome.Evince zoom

if it is not set to 1.0. See

gsettings list-recursively org.gnome.Evince

for all settings.

In my case I wanted it to always open documents at 150% by default, so here's what I found out that worked for me (I'm using Evince v3.22.1):

gsettings set org.gnome.Evince.Default zoom 1.5
gsettings set org.gnome.Evince.Default sizing-mode free

(I got the hint for the default zoom setting from here: https://askubuntu.com/a/214163/163034)

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