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See if moving them the attic works.

If you want suggestions on your design, suggest posting on Houzz. They have several forums, if this is a remodel, for example, you might post here: https://www.houzz.com/discussions/remodeling/

I have a Dormer playlist set up. Take a look at the other videos and see if they help.

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The automation built into the program is far from perfect. The auto backsplash is an example. You have the Custom Backsplash tool, or as you said, use cabinets for your fillers. Turn off auto filler generation if you want. You cannot save applied moldings, but you can save the entire cabinet to the library. Not really sure what you want, but you can add a Blank Area to your cabinets, or use something like a Soffit above them. Think about the tools available to solve a problem, not just the ones right in front of you.

Not all defaults are dynamic, and this applies to all objects, not just cabinets. You will need to manually reset some things.

See if this info helps. Use Soffit Surface for Ceiling

I've attached a door similar to what you are wanting to model. You cannot really "add" doors and windows, or multiple windows etc together in Home Designer. You can just push them up against each other. Untitled 18.calibz

Probably. You might attach the plan file and someone may take a look.

Read about Use Soffit Surface For Ceiling.

Using Architectural 2021 Trial (and I don't think this part of the program has changed from 2019) I created a full height cabinet, removed everything but the sides and top. Picked a random refrigerator from the library and placed it in the opening. When asking about symbols, like your refrigerator, it's important to identify the symbol. Where did it come from, what is its name etc. Symbols, like appliances, need a special setting (that Home Designer users cannot access) Inserts Into Cabinet Front. Your symbols may not have this set. For forcing something into a cabinet, use the center tools, or hold Control and drag.

Think about how your roof is framing. You might build, and then display roof framing. You may use the Delete Surface tool to remove surfaces to give you a view of what's going on. There is also the Use Soffit Surface for Ceiling which might be worth reading about.

They always use Pro for videos which doesn't help everyone else. Create a cabinet with an opening for your appliances, place them outside the cabinet, then move them inside.

Set the curved walls to No Room Definition.

Open a wall --> Structure Wall Intersections.

If that's checked and it's not showing, run a Plan Check.

Open the Build Roof dialog and review the settings. And for roof questions, it's key to say auto or manual roofs.

Suggest you contact the Home Designer folks directly.

You are loosing room definition. Check your wall connections.