Something else I've noticed is that when adjusting resolution, the window won't downscale to a smaller size.

Previously with Endless Legend on my old PC, I would sometimes downscale the resolution and increase the graphics quality.

Sometimes I'd play full screen, but other times I'd keep the window at a smaller size to keep other things open and in view.

Attempting this now with ES2, I notice the window still takes up the entire screen.
If I hover over the green button near the red "x" (to close window) and select "Tile Window to Right of Screen", the resolution then is able to drop to the select quality, however it is either distorted (as you'd expect) by squishing it (horizontally downscaled with vertical fullscaled) and fairly pixellated, or it will only show half the screen without squishing (such that the other half of the screen is "offscreen").