FYI - Found out the hard way that it changes the file system to read-only. Graphs1090 and set-gain would install and run but didn’t survive a reboot.
This is a new option to me after upgrading images from 8.1 to 10.1. Figured it was somehow related to the expand file system function in a separate submenu. Next time I’ll read the configuration notes. https://www.raspberrypi.com/documentation/computers/configuration.html