How do I turn off moving time?

8892094 said:

So despite being in average HR zone 3 and achieving high training effort for over 2 hours, I burned... 189kcal.

Moving time has no influence on the reported Calories. Calories are being counted by the watch continuously 24/24, using the heart-rate data, and regardless whether you record an activity or not. And of course, also regardless whether the time is considered moving or not. Only the heart rate matters, not your speed or moving time.

If the reported Calories seem to be too low, then there is a problem elsewhere. Probably either the avg. Resting HR is too high (check it at https://connect.garmin.com/modern/report/60/wellness/last_four_weeks) or the Max HR is set too high (check it in the settings of the device, and you may also want to disable the auto-detection in the settings, if the watch tends to set it too high) 

8892094 said:

Sure, I don't wear the watch outside of working out.

That's the problem. You need to enable the wrist HRM on the watch, and wear the watch also during the rest (even better also during the sleep). Only then the Resting HR will be detected, and the Calories counted correctly. The moving time has nothing to do with that, and will not change the Calories count in any way.

Hmm so you are saying If I only want to use the watch to record my workout, the calorie count for the workout would not be accurate unless I am wearing it for the rest of the day too?

FYI I am not interested in total calorie, I only want the workout calorie to be accurate. And I think that it isn't accurate because it counted only the time I am moving (moving time) instead of the entire workout. Therefore I need to find the setting/configuration on my watch to have it record the entire workout.

So maybe I am thinking this wrong?

Thank you for your help. It is still bizarre to me how it works...

As I wrote, the correlation between the immediate HR and the HRR (HR Reserve = Max HR - Resting HR) is used to measure the Calorie expenditure. There is nothing bizarre on it, it is actually much more accurate than using some standardized values based solely on the time and the type of activity. However the necessary assumption is that the Resting HR and the Max HR values are accurate. Without them you won't have any accurate Calories calculation.

Thanks. Let ignore calorie for a second. Do you know if I can (and how to) turn off moving time and just record elapsed time as total time?

The watch records always all of them. You cannot change that. Just use the one you prefer. Or do not stop moving.

That is the problem. I don't know how to "use" the time I want. The watch/app chose "total time" and I don't know how to make it use "elapsed time"

Can you please show me how? 

In this case, I would like it to display (use) 2:01:29 instead of 21:16.

Look at the Elapsed Time instead of the Total Time, if you need to know the elapsed time. You have all three values in the stats, as you have shown yourself.

... and if you need it for some reason in the Total Time field, just edit the activity, and copy and paste the Elapsed Time to the Total Time field.