I set the Relative Floor Plan Range to 1 Story above and 1 Story below. But it seems to forget these settings and constantly goes back to 0 stories down, so that retaining walls that are below the first floor plan are not shown in plan view. This is quite irritating, I must admit.
You need to change the settings in each view.
Changing the settings for FPCP in the main dialogue just affects what you see on screen.
As soon as you use another view it will revert to the settings saved in that view.
One of the forum moderators. Versions 6.5 to 27 Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10 Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11