New user and have just created a plan with 2 levels, representing the 2 storeys of my house.

Due to my poor drawing of lines, there are minor discrepancies with the outer walls of my 2 levels where these should be identical. Unsurprisingly, this looks slightly strange on the outer 3d view of the house plan. Is there any automated way of just aligning these quickly?

I could keep attempting to redraw individual outer wall lines manually but so far, I can still see the difference in alignment of the 2 levels.