How to return the flags to the Mac’s keyboard menu

For decades, Apple relied on a country flag as the primary indicator of which keyboard layout you’d selected in macOS for languages associated with a single country. In the last several versions of macOS, you select keyboards in System Preferences > Keyboards > Input Sources by clicking the + (plus) sign and browsing or searching for the layout you need.The flags helped some of us recognize and confirm the layout we wanted when multiple choices for a language were available, such as