Congratulations on the mod

Otherwise I have a problem:
I cannot travel to Ulgoth's Beard, although I have done all the quests in the Drizzt saga.

Therefore, I am stuck/block in the various maps of Drizzt Saga ...

Anyone has a solution plz. Thx

You should have access to the worldmap from the southern edges of the Mountain of Doom map or Bruenor's Cabin map. If not, you may have selected the wrong worldmap option during mod installation, they are different depending on which game you use, like classic BG1, BGT or BGEE/EET.
If nothing helps you need to use console, again the area code to use would depend on the base game you use.