To turn on the mirror guide without using the menus, just tap the bases of both controllers together Motion controllers touch bases.
To turn it off again, tap the bases together again Motion controllers touch bases.
Remember that the mirror always appears in one place in a sculpture once turned on. To have it somewhere else, you need to start new sculpture New sculpt.Next: Color Picker
The Dreams User Guide is a work-in-progress. Keep an eye out for updates as we add more learning resources and articles over time.