Hi @LeahFlumerfelt,
Welcome in the Community !
You can change your preferences regarding the default option of the platforms and graphs. To do this, go into "File", "Preferences", and then check the panel tab "Style". You should find options for the graph background colors :
Hope this answer will help you !
Victor GUILLER
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)