Several questions

[Anonymous]

Why sometimes happen that some walls not intersect each other?
I have a wall and slab using the same material, how do I do to not show edge lines?
I have a front wall in the section and I still seeing line for the other wall in which is intersecting, how can I hide this line?
How do I change the "blue" section line colour to other colour?
Sorry about all these questions, but I´m a new user, I hope some one can help me.
Thanks
Julia

[Anonymous]

To walls to intersect you have to make sure that:
-their axis lines meet
-walls are meeting somewhere in their heights
-are on the layers with the same intersection # (and it cannot be 0 - 0 is always unconnected)
The line on elevation - double check if walls intersect properly on a plan.
The section "blue" line is set in Section dialog box.