The 3D view is where you work now
Fly to where you are looking, draw roofs on the walls they sit on, place doors and windows by clicking the actual wall, and put the model in weather with fog.
From preview to workspace
The 3D panel used to be where you checked your work. Over the past couple of weeks it became somewhere you do it.
Travel: double-click where you want to be
Turn on Travel next to Orbit and Walk, then double-click anywhere in the model. The camera flies there.
What "there" means depends on which mode you are in, and that is the whole design. In walk mode a floor means stand on it — eye height, facing the way you were, looking level rather than at your own feet — and a wall means stand off it and face it. In orbit mode the point you clicked becomes the pivot, because landing somewhere with the pivot five metres behind the wall means orbiting about thin air.
On a phone it is a double tap, read from the pointer events rather than from a synthesised double-click, with thresholds that suit a fingertip. There is a speed slider in the ⚙ View menu if the flight is faster or slower than you like.
Draw a roof on the walls it sits on
The roof tool now works in the 3D view as well as in plan, in both polygon and rectangle mode. That is not just a second place to do the same thing: a roof is traced along the tops of walls, and in 3D those are the thing you can see and snap to, while in plan they are lines you have to work out.
Every gesture is the one you already know — click to place a corner, click the first corner to close, Enter or a double-click to end, right-click to commit, Escape to abandon, orbit between corners, type a dimension. Point at the top edge of a wall and the snap marker appears before you click.
Place an opening by clicking the wall
Doors, windows and pictures can be placed by clicking the actual wall in 3D. For a picture this is the only way to express the thing that matters most — how high up it hangs.
The click has to land on a wall. Clicking the floor in front of one and having a door appear in whichever wall happened to be nearest is not placement, it is a guess, so a miss does nothing at all.
Fog
⚙ View → Fog fades the distance into a colour you pick, with a distance where it starts and one where it has swallowed everything.
It is linear rather than exponential on purpose. The exponential kind looks lovely on a landscape and has a single control — a density in units nobody can picture — so a model at the wrong scale comes out either crystal clear or inside a cloud with no way to tell which way to turn the knob. Metres are something you can reason about when the model is a house.
The sky is deliberately left unfogged: it is the backdrop the fog fades into, and fogging it paints the sky one flat colour and the horizon disappears. Set the fog to your horizon colour and the ground runs out into the sky. It saves with the scene, so a published model opens in the weather you left it in.