How to turn off step counting on Vivoactive 5 when driving

The accelerometer on the watch is detecting some sort of arm movement and registering it as steps. I don't own a vivoactive 5, but on my watch this sometimes happen on a very bumpy road, but not often.

These are not ideal, but some possible workarounds:

• Remove the watch while driving
• Wear the watch on the other wrist
• Turn off activity tracking only when driving - vívoactive 5 Health and Fitness GPS Smartwatch Owner's Manual - Turning Off Activity Tracking
• Contact Garmin Support to report the issue. 

Thank you for your reply.  When I try to follow the instructions to turn off activity tracking by pressing button A from the watch face, I cannot see how to get to Settings!

You have to hold down the A button for a second or two.

Thank you for your reply again.  This is exactly where the problem lies with my watch; for some reason it's not the A button that takes me to Settings, where I can turn off Activity Tracking, it's the B button!  It took me a very long time to work this out since all the instructions are telling me to press the A button.   I've found the option to turn off Activity Tracking now, so I will try it next time I drive my car.  I will come back on here to report if it does not work.