In addition, the following gestures are supported. Hold the pen side button, touch the pen tip to the screen, and
- flick left to undo
- flick right to redo
- flick up to open the color picker
- flick down to open the tool picker
Unfortunately, Google currently blocks the use of the side button in third-party apps on Chrome OS. If you have a device with a side button, such as the Pixelbook Pen, it can only be used with the Google Assistant. If you would like to use the side button in Squid and other third-party apps, please contact Google support and request that they change this!