How can I reduce decimal figures to 2 digits

I need to have only two digits after the point in calculations results.

Could you provide us the form where you want this implemented?

But, from your screenshot, I presume that you have added a Form Calculation widget and the "Total" value points to that.

Just open the Widget settings > select the "three dots" as shown below.

Select the Options tab and check the options as shown below. Go Back and Save the Widget.