Sometimes screens span more than one page and one must scroll down/up to see their entirety. There is an option to make a screenshot include the entirety of a web page within Safari, but I’m not aware of any built-in facility to do the same for other screenshots, e.g., screenshots of Settings.
Tailor is able to stitch together multiple (overlapping) screenshots into a single image and it seems to work well.
Does anyone recommend a different screenshot-stitching app?
TidBITS article ~2 years ago and have been very happy with it ever since (though I’m a light user).