Drawing styles
The Styles row sets how the whole drawing's lines, fills, hatches, text and dimensions look.
To change how cut walls and floors look
Open Styles and go to Fills. Poché sets the fill of cut elements and Shadow sets the colour of shadows.
To thicken or lighten the linework
Under Lines, choose a Line colour and an Annotation colour, and drag Line weight %.
To make hatches finer or coarser
Under Hatches, pick a Hatch colour and set Hatch scale % between 50 and 200.
To resize text and dimension marks
Text has Annotation text size in millimetres. Dimensions and markers sets the automatic dimension ends (Tick, Arrow, Open or Dot), Dimension end size, Marker size and Tag leaders. In the 3D view section, tick Sky and choose a Background.
To keep a look for every new drawing
Click Use as my default for new drawings and new drawings start with these styles. Reset this drawing returns this one to defaults. Both buttons become available once you've changed something, and each colour swatch has an Auto option that returns to the default look.