Didn’t know this, so apologies in advance if I’m pointing out something well known!
I was looking for a way to check if the Navigraph database was indeed being used, while pottering about with the default 737 Max FMC, and came across this…
In MSFS 2024, to determine which navigation package is being used (in free flight, not checked other modes), go to Settings > Advanced Options, and switch on Developer Mode. Using the menu on the top left, choose Debug > Airports, and switch “Debug Navigation Data” on.
Then , at any airport, the navigation data and it’s source will be displayed for all runways etc (overlayed) on screen. Font is white, and a bit small, but readable against a dark background. External view seems best.