You mean getting rid of this message?
Press any key to continue
There are 2 possible solution, but I can't guarantee if it works on your modified map:
1.Use a default loading screen, which was commonly used in melee maps (accessible via "Scenario" -> "Map Loading Screen"):
View attachment 432565
2.If you still had the problem with skipping the loading screen, make a trigger like this:
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Player Group - Pick every player in (All players) and do (Actions)
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Loop - Actions
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Game - Force (Picked player) to press the key Enter