You won’t even get as far as being invited to enter a new size, as Disk Utility comes straight back with an error. Now, follow Apple’s instructions for resizing that disk image using the Resize… command in the Images menu. To stop that, simply select your internal disk at the left, and it should behave more normally again. This is likely to provoke another lesser bug in Disk Utility: it will now start showing bursts of the spinning beachball and be sluggish in response. Once it’s created, eject your new disk image. You can make its image format anything you like, including a standard read/write disk image or either of the sparse options. Use Disk Utility’s File/New/Blank Image… menu command to create a new disk image, setting its format to APFS, and its size to something reasonable like 100 MB. And I believe that this has been the case since the first full release of APFS in macOS High Sierra eighteen months ago. But if you create a disk image in APFS format, Disk Utility has a problem: it can’t change its size. Most users prefer to create and maintain them in Disk Utility, as the command tool hdiutil which handles them is so complex. Disk Images are a popular way to deliver software and a great deal more.
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