Calculate Net Scores is a setting that turns handicap calculations on for the round.
From the home screen:
Press Start Round
Select your course and teebox
Under Round Options: turn Calculate Net Scores to ON
With Calculate Net Scores turned ON:
You will see a course handicap value on your scorecard
You will see dots on your scorecard which represent your course handicap
You will have a net score: Gross score - Course handicap = Net Score
With Calculate Net Scores turned OFF:
You will not see a course handicap value
You will not see any dots
Your score on each hole will be your round score ( your score in relation to par)
There will not be any net scoring
If Stableford is your scoring method > you will be scored off of scratch