How to assign a name to the wall in DesignBuilder software

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Hello, everybody! I have a small issue with naming the walls of my building. I am using ResultViewer software to check the temperature of each wall. When I am obtaining my results I can see four walls on the first floor, they are marked as WALL_2, WALL_3, WALL_4, WALL_5. See in Picture 1. The problem is that I do not know which wall is north/south/east/west. I tried to rename them in the DesignBuilder software in "Navigation, Site" panel, (see the Picture 2) However, after I save my file and open it again, the names of the walls return to the default (Wall - 27,000...). I mean, I want to rename them as Wall North/Wall south/Wall east/Wall west, instead of Wall - 27,000 m2/Wall - 36,000 m2...(as in the second picture). Thank you in advance! ,