solver

Make sure none of your walls are set to No Room Definition. I imagine at least one of the exterior walls is.

Your Attic space needs to be a room type other than Attic -- even Undefined will work.

I'll make the same suggestion made on ChiefTalk. Contact Chief Architect directly for help.

Could you post a picture of what you want to model? Does not need the knee wall, just the greenhouse portion. Many types of greenhouse construction methods.

What you are seeing is an artifact from the wall dividing the 2nd floor. Open that wall and under materials, change all drywall to Insulation, Air Gap. Also try changing that wall to a Room Divider.

Select it in Camera View and delete it.

You need to divide the space on the 2nd floor into 2 parts (rooms). One a Deck, and one Open Below. Draw a wall across the space, make it invisible.

No.

What "walkthrough" are you speaking of? You may think of the space as an Attic, but to the software, it's a 2nd floor, and best to refer to it that way. How about posting your plan file (not a picture of your plan, but the actual file) so we can see what you have now.

Good!

Forgot to attach.

Set all your 2nd floor interior walls to No Room Definition. Set the ceiling back to 1-1/2". Widen the gable wall until the roof looks like you want. Turn off Auto Rebuild Roof. Raise the ceiling. Uncheck No Room Definition on the interior 2nd floor walls.

You already have a 2nd floor, no need to add anything. Switch to the 2nd floor, turn on Reference Display to show the walls below, and draw in your needed walls. Use the Align With Wall Below tool to perfectly align them.

Start with this. I made a section of the front wall gable and auto built the roof. Now you need the roof to continue across the gable. Break the main roof, drag it across, use the join tool to join it to the far side. http://screencast-o-matic.com/watch/cbetFg6doI

See https://chieftalk.chiefarchitect.com/topic/13201-muntins-mulled-arched-top-windows/ Some info I posted in Suggestions on ChiefTalk. I used a feature in Chief, Custom Mutins, to fix the problem., that you don't have in pro. I don't understand this. You should use a 1-1/2" rough ceiling height instead of a 0". What roof planes, and what stretch? Images of your model would help.

cabin_45_fill_in_cathedral (2018).plan

Glad I could help.

Right click somewhere outside the walls of the structure. Paste, then Paste, then click where you want to place the window/door. Or Control-V (on a PC) and click where you want to place the window/door. You can also copy and paste the wall containing the door/window.

Create a new plan using the Arts & Crafts template. Place a Door and a Window in the plan. Select one and copy into your working plan. You may also, (I think) add the door and window to the library, making them available in any plan.

cabin 11-X5 as-is (2018).plan

Post one and I'll see if it can be done.

Looks much better. Don't know why the software ships with these settings. It's the first thing people complain about and it's not clear what needs to be changed.

See if you have this setting. It's new in the latest version of Chief, may also be in Pro. Here is Ambient Occlusion at 12. And at 92.

Did you close and reopen your camera view?