From Garmin-Kevin 4 months ago...
"All,
This report has been resolved with software 4.54 release. If you are still experiencing this issue in Garmin Connect Web, or after updating your mobile device to software 4.54, please start a new thread."
I still have the issue of watch set for Meters and showing all swim activity, data fields and so on in Yards. Issue is not resolved on my Forerunner 955 or the Forerunner 945 two of my friends have.