If you need to hand-draw something for your product design, Mockplus DT also has a Pencil tool for this purpose.
To use the Pencil tool:
Select the “Pencil” from the toolbar.
Alternatively, you can press P on the canvas to use this tool directly.
Pencil Tool Shortcuts
Esc: Leave the Pencil Mode.
Ctrl+Z: Undo the path point.
Ctrl+Shift+Z: Restore the path point.