You may be better off just using the laptop with no monitor connected, since Apple engineers only seem to test MacOS using 12 inch MacBooks. If you do connect a large external monitor, you may as well cover the entire screen with a sheet of cardboard and then cut out a section in the bottom left corner.
I use a MBP with a 30 inch, 2560x1600 monitor. The monitor is set to be the main display. I frequently use the laptop offsite with only the laptop screen. After I get back and connect the 30 inch monitor, this is what happens:
1. Finder windows that were in the top left corner or the center of the 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 were centered on the laptop screen and covered most of 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. DVD Player application in MacOS 10.14 Mojave keeps opening in the bottom left corner of the 30 inch monitor no matter how many times I move the application window.
When I use the laptop offsite, I am afraid to open applications or work on documents for fear that everything will be thrown into the bottom left corner of the 30 inch monitor once connected. When I return home and connect the 30 inch monitor, I am afraid to open any applications or documents for fear that everything will be thrown into the bottom left corner of the monitor. I doubt that all the Mac application developers conspired to purposely put their applications in the bottom left corner of the screen. So I must conclude that this is a problem in MacOS that Apple needs to fix. I first noticed this irritating behavior in 10.10 Yosemite and it continues to this day.
If you think this looks annoying on a 30 inch monitor, think of all the fun you will have with a 38 inch or larger ultrawide monitor. It may help to put the monitor on a stand and position it so you are looking directly at the bottom left corner of the monitor. That is apparently what Apple engineers do.
Can everyone please share screenshots of your own experiences with this irritating, idiotic, brain-dead window positioning behavior in MacOS? I have never seen an operating system handle window positioning as STUPIDLY as MacOS.
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