It's indeed a permanent "no dragon zone" and so you can't disable these barriers.

But (I hope!) you've already find your way to Camp Harbour and the Dragon Slayer Camp ... wink

I used many times the blue teleporters to fast travel to Camp Harbour etc ...
I maked myself a nice fast travelroute for visiting each possible shopkeeper each level (or more) smile .

O, and Welcome to the forum !
wave

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !