Most of my laptops are 1366x768. In fact, in a recent KDE survey, the developers got extremely surprised about how prevalent low resolutions were (it was linked around a few months ago). All developers are out of touch a bit, however, let's not forget that this issue wouldn't exist if Linux users weren't allergic to anonymous data-sending with statistics like these. Yes, no one likes privacy invasion and telemetry, but statistics like these are needed by developers.

BTW, on Gnome you can use the ALT button to move windows around when they don't fit. Still annoying though. Mint has 2 such windows too (their login prefs, and their panel settings pref).

Edit: More info here https://blog.davidedmundson.co.uk/blog/metrics-in-kde-are-they-useful/

If you use Xfce, you can make your display bigger than its maximum resolution by using scale in display settings. Chose "Custom" and set it to 0.5/below. Don't set it to above 1 because it will make your display smaller and don't set it too low because it will make your display blurry. If you encounter an issue when play game, you must revert your setting.

You can do this too with xrandr but i don't know if this will work in desktop environment. You may try it if you want. I never try this with wayland.

Sorry if my english is wrong

Edit: change 0.9 to 0.5.

first off, you're not alone out there because standard 1080p screens are often ran at 150% which is equal if not worse to your use case.

gnome is downright abhorrent about their gigantic, space wasting UI elements. moving to plasma was like gaining 30% display area. like, the insanely large title bar in terminal, with huge buttons in it. who clicks on stuff in a terminal?! and does it so often it warrants those things present as default?