Erase while using Stylus as Pen
When using the option to have "Stylus as Pen" in the Android version, there is no way to undo or erase errant markings.
Thanks for your feedback. Undo/Redo is now available in our beta testing version \o/ ! If you are interested in trying it out at an early stage, please consider joining the beta testing program: http://feedback.xodo.com/knowledgebase/articles/829551.