Hi,
Sorry for any inconvenience. Recently 3Dconnexion and Fusion 360 development got together to introduce a tighter integration between Fusion and spacemouse.
This includes: Lock horizon (constrained orbit) and full command customization. It also included a pan/zoom "lock" on sketches, which was based on popular requests when we were doing research. It happens any time the "camera" is looking orthogonally at the sketch plane. (via look at command, or view cube)
What was left out (by accident) was a way to turn it off. The new functionality was under preview for a few months and we didn't hear from anyone who disliked the pan/zoom behavior. However, after the recent graduation from preview to full time operation it is apparent that some users want an option. 3Dconnexion is working now to produce a driver that allows for this sketch behavior to be turned off if desired. Sorry for the inconvenience while this is settled.
In the meantime, try any of these workarounds.
1. Use perspective camera - this effect will happen 0% of the time.
2. Turn off "auto look at sketch" preference - to avoid looking orthogonally at a sketch as you start or edit it.
3. Orbit with your mouse, or the orbit command, or the view cube to "break" the lock on the sketch plane.
Phil Eichmiller
Software Engineer
Quality Assurance
Autodesk, Inc.