Black background in sections

[EXPODTL]

Somehow my sections are in black background, can someone tell me what control did I accidently push and what I can do to return these sections to a white background?  Archicad 20

[Stuart_Clark]

With the section open go to view>grid and editing plane options>grids and background

Double click the background colour and change it to the colour of your choosing.

Sometimes opening DWGs can set backgrounds to black by default.