Section viewport: i can't apply different color fill to the section

[G.B]

Hello,
I'm using the demo version of vectorworks 2020 to evaluate the purchase.
I have a problem with the section viewport: I'm trying to apply color fill to the section, but I can't. In fact, with the exception of black and white I cannot apply a different color, for example gray or red or blue etc.

No one  has the same problem? 

[EAlexander]

When you make a section viewport - there is a class created called Section Style.  This will have the default line weight and fill color for a section cut - adjust this class, and your section should update.  Note, you'll have to use the UPDATE button on the Object Info Palette to update the viewport with the changes.

[Pat Stanford]

Also, if you are trying to use Class Overrides to set the colors of objects in certain classes, those objects must have the attributes you want to change set to "By Class" rather than a fixed value. That means you might need to set the attributes of the class so things display as you want on the design layer.

[G.B]

Thank you@EAlexander  and@Pat Stanford .

I did it (or i think i did all), but i still have problems.

I'm using the italian trial version, i did not say it before.

If you look the first pic all is right, it's want i expect to see (all the different materials), but when i want see the section with a color fill there is the problem.
For example in the second pic you see the section in black, than i want it in red and i change  the setting, but instead of red, the section is white. 
Sometimes, during my test,  the contours of the section disappear despite the outline being active in the options.