Using the Solidify Modifier

Steps:

  • Select Object – Choose the object to which you want to apply the modifier.
  • Open Modifier Panel – Go to Properties > Modifier Properties (wrench icon).
  • Add Solidify Modifier – Click Add Modifier and select Solidify.
  • Adjust Thickness – Use the Thickness slider to control the extrusion depth.
  • Apply Modifier – Press Ctrl + A or click Apply (must be in Object Mode).