What does this field actually do?

Hi

I have a view that include a calculated field called "total_times_used_minutes". This field calculate the sum of two fields.

I have noticed the field

and tried to activate it so that it shows

but I do not see any differencies? what does it do?

What I would like to see is that the total sum of the calculated field in the view (in the bottom of the column where I have the calculated fields).

If the above does not solve this, do you know how to do this

Br Skouboe