The sketching of walls is only possible with a touch screen (tablet).
Step 1: Chose Room Height and set your height.
Step 2: Choose Walls.
Step 3: Choose the pen.
Step 4: Pick the starting point of the first wall for example the Room Height.
Step 5: Drag your finger across the screen to sketch the desired wall length and direction.
Step 5: Lift your finger off the screen to confirm the position.
Step 6: Repeat the process and drag your finger across the screen to sketch the next walls.
Step 7: End the command with the blue tick at the top right.