No, the side switch buttons cannot be customized, however the buttons have preset functions built in. Function is dependent on application and the location of the switch may vary depending on the type of pen.
[Wacom Canvas]
- Switch near the pen tip: Small Eraser*
- Middle switch: Switch between pen tools
- Switch near the tail: Hand tool*
- Tail switch**: Large Eraser*
[CLIP STUDIO PAINT]
- Switch near the pen tip: Eraser*
- Middle switch: Eyedropper*
- Switch near the tail: Hand tool*
*While holding down the switch, you can temporarily switch tools and operate them.
**Tail switch supported pen can be use. e.g.: Pro Pen 3E