Hi there,

#1. I fixed this issue, to edit logo image size, please go to edit header with Elementor -> select Mobile mode -> Click Image and edit size image https://prnt.sc/10iz8xd

#2. To edit 404 page, please go to page Edit 404 page with elementor

#3. To update Elementor Pro plugin, please deactivate this plugin -> delete it then re-install plugin via notice This theme requires.
I have just updated the latest version plugin for you