How to calibrate distance manually - treadmill

Thanks for the answer. As it says I can do it first time but i can not figure out how to do it later as it says in this line:

* To manually calibrate the treadmill distance after the first-time calibration, select > Calibrate.

I only get the option to delete or save when activity is over.

Can you give little more detailed help.

You will only get the ‘...’ option if you run more than 1mile/1.6km

Yes I do that - normally run between 7-10 km - then I press the key and then done and then I get the opportunity to save og to delete only.

Hmm.. I’ve never had the issue of the three dots not appearing.

Just to be clear (maybe stating the obvious) - the distance recorded by the watch has to be greater than 1mile/1.6km before the calibration option is enabled.

Last night I ran 3 miles on a treadmill using a pre-built workout. At the end of the workout I only got the option to "Save" or "Delete" (Once I had the calibrate option appear. I calibrated at that time on that treadmill, and I haven't seen it since.) Turns out with my FP and VA3 the distance was about 2.5 miles, the treadmill read over 3 miles.

A couple of things:
-Who says treadmill displays are remotely accurate?
-How do I manually calibrate a run (as the OP asked?)

i think there's a bug.
i too haven't seen that '...' after calibration months ago.
so recently I wanted to, but didn't see any.
so basically I changed the distance on the garmin connect app.
next session, the '...' appeared on the watch...