The Colors form allows setting the colors when displaying events and segments by double-click on the related color cell:
Events without media - All events for which no media has been associated.
Space expiring today - Events which booked space expires in current open day.
Free space - Segments without events scheduled.
Segment to reload - Segments modified (e.g. events inserted, duration changed, etc) which needs to be reloaded.
Segments with modified structure - Segments inserted or pasted using the 'modify segment' function.
Event associated from Executive Editor - Event scheduled from Executive Editor and manually associated to an Air Sales structure (i.e. block). This events are also highlighted through an icon.