making dungeon hall and cave seamless

Frosty

So I am trying to make this dungeon hall entrance look seamless going into this cave but it does not seem as easy as changing a layer, at least not after I drawn some. And with the cave itself I imagine when I draw it I could change properties to get rid of the border so I can keep adding to the cave / caverns without black lines. Any thoughts appreciated.

Loopysue

Have you tried moving the end node of the cave wall section, and while moving it using F9 to snap to the closest node/point on the corridor end?

Or, if you have any experience with the trim tools in the Edit menu, you could try hiding all but the wall sheet(s) and use the tools to trim the ends to each other. Instructions are given in the command line depending on which tool you use.