Black Screen issue at the start and end of presentation on Keynote

when ı start a presentation on keynote it starts with brief fade in. Also ıt ends with a brief fade out. I mean for split second you see a black screan.

Unlike keynote, powerpoint starts immediately.

For example lets say first slide and the walpaper of the mac are same. If ı start the presentation on powerpoint nobody can say the presentation is run. But if ı start same presentation on keynote because of fade in everybody realise that something is changed.

[Re-Titled by Moderator]