select multiple edges problem

[MARK_6]

Hi all, I would really appreciate if anyone could help me.

The above operation I can only manually select one edge
Multiple edges cannot be selected with Ctrl
(When I try to select multiple edges, the picture is placed below)

 

[MrCATIA]

I believe you can only build one wall at a time, so it won't let you select multiple edges.

 

[MARK_6]

Thanks for your reply，It should be a version issue，Many people on youtube have the same problem