Apple engineers only seem to test MacOS using 12 inch MacBooks. If you use a Mac laptop with a large external monitor, you may as well cover the entire screen with a sheet of cardboard and cut out a section in the bottom left corner.
Below are examples of working with applications and Finder windows on a MacBook Pro laptop screen, then connecting a 30 inch, 2560x1600 monitor as the main display.
1. Finder windows that were in the top left corner or the center of the laptop screen now open in the bottom left corner of the 30 inch monitor.
2. Applications such as Photos, News, Stocks which I put in the center of the laptop screen now open in the bottom left corner of the 30 inch monitor.
3. Documents from applications such as Keynote and Omnigraffle which filled the laptop screen now open in the bottom left corner of the 30 inch monitor.
4. DMG disk image files for various downloaded applications frequently open in the in the bottom left corner of the 30 inch monitor by default.
5. Some applications such as DVD Player in MacOS 10.14 Mojave or Powerpoint keep opening in the bottom left corner of the 30 inch monitor no matter how many times I move the application window.
I first noticed these issues in Yosemite 10.10 and they continue to this day. If you think this looks annoying on a 30 inch monitor, imagine how it will look on larger ultrawide monitors. Yet somehow we are supposed to convince ourselves that this is "normal" and people should position their monitors so they are always looking directly at the bottom left corner of the screen. I have never seen an operating system handle window positioning as STUPIDLY as MacOS.
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