Removing Walls from a Tilemap

Arcade
#1

How do you remove walls from a tilemap? Right click removes the tile, but if it was marked as a wall (red highlight) this remains and I can’t find any obvious way of removing the wall highlight.

Thanks for help

#2

Click the wall button and then use the erase tool to erase the walls

2020-02-25 13.00.30
2020-02-25 13.00.30965×656 182 KB

#3

Aha!
I see how you can draw lines/rectangles of walls too.
Thanks for speedy response.