solver

I did not look at your plan, but search my YouTube channel for backsplash for an idea for the braces.

Open a wall and review the structure panel. Settings are there. Check Help for specifics.

Something like this?

You can do things like this easily with Architectural and Pro.

You would get better help if we could see what you are trying to model. A head on picture taken from the street does not provide enough detail. You must do this with walls and use a doorway or window etc to create the arch. You don't need to use only walls. You can use soffits too. Walls and soffits can share the same space, or soffits can be positioned on the wall to give you something to place a molding on. Try to think of the tools you have available and what they are capable of, then use them as needed to build the model. With Suite, you have limited options, so you need to make up for the shortcomings of the software.

Try setting the floor and ceiling defaults in the terrain plan, then copy the house to it using Edit Area.

Read in Help about Reference Display.

Could you show a screen capture so we see what you see?

I opened the plan you attached in Pro 2021 and was able to make all sorts of changes.

And just a FYI. The plan did not need to be updated to X12, it just needed to be opened and that Allow For Editing flag set. Any version from X6 on could have done it.

How do you know it was checked? I've never seen this not work. Could you attach the plan file and I'll take a look.

Select the terrain and click this (look in the Edit Toolbar). Reshape the hole created if/as needed.

I did this in 2 minutes. Try working each problem by itself, and do so in a new, simple plan. Once you are successful, start working in the real plan.

Except for the roof, that looks like standard construction -- walls with windows. For the roof, change the structure to be thin like the glass and materials to Opening No Material and glass.Use roof framing for the battens. Build the roof thicker, build framing, then build the roof thinner so the framing protrudes.

Do you have a representative picture of what you are trying to model.

Often you can find answers by searching the Home Designer website.

Materials Panel. Set the Soffit to Opening No Material.

I think you need to spend some dedicated time watching videos/reading articles/documentation. Don't know what you use the software for, but if it's for business, it will make you more efficient, and you will probably learn things you did not know about. And if you are still using 2018, consider an upgrade when 2022 comes out next year. Lots of new features introduced over several years. I was using Premier in the video, but yes, Pro will show trusses and joists.

Structure panel. It's Eave Fascia.

Look under structure -- it's a checkbox. Look under Materials. You cannot remove, only change.

What tool do you have available that would create an arched opening? Hint -- they are all over the house.

Watch on YouTube: http://youtu.be/BTw4uVVQweY?hd=1

You can make square columns from cabinets, soffits or shapes. Image is a cabinet. Similar for the arched opening.