Do i enter annual home office expenses or just a portion of it on Turbotax online?

I have home office expenses from my self-employed job. How should I enter that into Turbotax online? The software asked me to provide "total amount for expenses." 

 

Does that mean I put the total cost of rent, internet and utilities for the entire year in the section? Will turbotax calculate the percentage usage automatically? Or do I need to calculate the percentage usage manually and put that number in home office expenses?

 

Thank you