You will need to go to the settings for your elevation/section.
Then go to the "Model Display" section and for the "Uncut Surface" set the "Fill uncut surfaces with:" to "Nothing".
Barry.
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