IIRC Bill Atkinson said that it is at the top because it was easier to code. at any rate, it’s true that screen edges and corners are easy to click because their hit region becomes infinite in one or two directions

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WillAdams 2 hours ago | parent [-]

It was tried out per window, but changed:

https://milos.fyi/blog/fitts-law-why-the-menu-bar-is-at-the-...

	▲	efortis 40 minutes ago \| parent [-]
		In this video Bill explains why he moved it. At 28 min he says: "…and if the window is near the bottom, how are you going to show all the choices? Well, I tried moving the menus to the top of the screen." https://www.cs.cmu.edu/~bam/uicourse/05440inter2019/Bill-Atk...