I rented room of house 150 days of 2018. Rent use=%rental*150/365, but click "no, this property was not rented all year" then turbotax=150/365. How do I get correct %use?

I rented room of a house for150 days of 2018. Rent use=%rental*150/365, but if I click "no, this property was not rented all year" then turbotax calculates 150/365 which assumes full rental use for those 150 days. How do I get correct %use?  Previously, I would cacluate the % myself and put it in after selecting that the property was rented all year which I can do again if I must because turbotax is not smart enough to figure this situation out.  Help is appreciated!!
Thanks!