I'll never know which settings had been causing the problems, but using the DEFAULT command brought my iMac back to its brand new condition. I just saw a command that said something like "Restore all defaults," so I chose it thinking that it could do no harm.
Even better, Onyx fixed the problems even though I had no idea of how to use it.
Cleaner, DL Cleaner Lite, and many more programs. Best mac cleaner free download - DL Cleaner, Dr. Acronis True Image 2019 Standard (single license) costs 49.99 (per computer) from the developer’s website. They couldn't help me, either so, having nowhere else to go, I tried Onyx, and not only did those two problems disappear, but also another one that I had resigned myself to. Mac cleaner free download - Movavi Mac Cleaner, Apeaksoft Mac Cleaner, iMyFone Umate Mac Cleaner, and many more programs. Clean your Mac with one of these best Mac cleaner apps. I had had a couple of problems that they couldn't help me with, so I called Apple Care. This can save you invaluable disk space not just on your Mac but even on any external storage device. All copies of a photo are deleted except the original one. Anyway, I used Onyx WITHOUT THEIR PERMISSION, and it worked. Photos Duplicate Cleaner creates groups of duplicate photos so that it is easy to find out the number of occurrences of similar photos and clean selected duplicates. See If you sign out of your Apple ID preferences.
I had assumed that Apple Support Communities would be against Onyx, because they are against everything that doesn't come from Apple, and they like to argue too much for my taste. Remove a device in Find My on Mac - Apple Support Best Education From Education Signing out of iCloud turns off all iCloud features on the device.