Mark3D

I had a try at setting foundation heights first i set the foundation defaults to suit the new work then made sure they were set to defaults in the rooms then i manualy set the existing to the different heights it always good to get the defaults correct for the main part of your building with the fire place those walls are set to railings untick railing and use shelf ceiling as david point to in video also x12 can now select doorway with no casings that is one of x12 new features Waltner Addition 2020 Updated.plan

Could you cheat and put a poly line solid over the top so you elevation looks correct

open the exterior wall it sits on, under roof tab un tick upper pitch you must have selected it and forgot

Here is a file it maybe what you are trying to achieve it is in X7 Pool House v4.plan

What version of chief are you running I played with the file but it seems like it is very old version

Here is a link to the file https://drive.google.com/open?id=1-2PrXmIBT6R9GQVJBMSIJpYegCPcdjZa you will see i just put elevation region set to zero to flatten the terrain under the building

is this what you want

Could you put the file on drop box or google drive and share a link

Try deleting the plants and trees then see if the file is smaller you will have made a mistake with terrain elevation data also you could try changing the layer colour for elevation data in floor plan view to some thing that stands out to help with trouble shooting

try posting your plan, your base line might be off angle not in line with wall

Also i forgot under rail style you can select follow terrain

try fence and set to balusters

Try this file it might be what you want if you want the roof fixed you need to show what is required you may have some plans or photo to help explain Shire_copy.plan

check this file and see if that is what you want bath.plan

is that what you want