I love playing in 800 x 600 on a 1920x1080 monitor as much as the next guy but...yeah. Maybe windowed mode could be adjustable too.
I know how you feel, but I kinda got used to it There are some apps to stretch the game window, it's not beauty but could help you. Check this guide: https://royals.ms/forum/threads/how-to-stretch-windowed-mode-to-a-larger-resolution.51318/