When you maximise (Apple calls it "Zoom") a window on MacOS like this:
Then it fills the screen like you'd expect from normal operating systems. However unlike other operating systems it doesn't enter a distinct "maximised" state. It just happens to fill the screen. This mostly doesn't matter but there is one really really annoying consequence that isn't an issue on other operating systems.
"Zoom" a window, then move your mouse all the way to the right edge of the screen, click and drag up or down. On Windows it will select the scroll bar and scroll your document.
On Mac is grabs the edge of the window and resizing it. Normally this also shrinks the window to half its size for some reason.
It's infuriating! Is there any way to fix it?
