Powerpoint has allways allowed drawing, but it has not been available in a friendly way as in painting programs.
I have quite old powerpoint where the drawing tools are not visible until one selects them in tool customization to be shown.
There's 2 major subtypes of freehand drawing:
- inserting freehand lines. It has been well hidden in Draw tools. It's a subclass of lines in AutoShapes. The result is a vector path. Editing them is possible by moving the path controls. Hopefully the starting is not hidden as well in a modern Powerpoint.
- ink drawing. It has own toolbar. The pen and ink can be selected after opening the dialogs
Here's a sample screenshot. Ink drawing tools have been selected to be visible as tools customization option, the color menu has been opened and there's also a random shape drawn with Wacom. It's much smoother than after trying the same with a mouse.