Is there a way to get rid of the lines that occur when the door is hung on the wall?

[LeeJaeYoung]

You have to select and mount the overlapping walls each time. at least 3 times

[Lee Hankins]

I’ve always found it really annoying that the door frame line pen overrides the wall pen when doors sit close to wall junctions. The wall pen should always take priority. I’ve seen lines like that occur when there is a sill or threshold associated with a window or door but the level of detail is set low in the object or model view options so it creates that single extended line. If you turn the threshold of the door off or adjust the dimension of extension past the edge of the door opening to ‘0’ does the line then disappear?

[LeeJaeYoung]

turn the threshold of the door off

adjust the dimension of extension past the edge of the door opening to ‘0’ does the line

This phrase is difficult to understand precisely.
If you show the image, I think I can understand easily.