Vehicle used for Food delivery but TT online asking for depreciation, market value, etc ?

I used my personal vehicle to do food delivery via Doordash.

In 2020 i did about a month of it using my personal vehicle and stopped. Still have the car.

After claiming standard mileage I get asked this question:

 

Q: When did John start using this vehicle for your work?

Answer: 01/01/2020

 

Next to the question there is a

Checkbox: John stopped using this vehicle in 2020 - If i mark it i get the following too.

Tell us when they sold, traded-in, gave away or stopped using this vehicle for your work.

 

If i mark the above check box and put in a date of sale, then in the next pages I get  questions: if i converted the vehicle to personal use,  depreciation and market value, sale, etc. If i leave it unmarked, those questions are gone.

 

The thing is I did stop using the car for Doordash and normally keeping it for my own personal use, but why am I being ask all these questions about depreciation etc?

 

I just want to take the standard deduction for mileage, so should i not check the box where it says i stopped using the vehicle in 2020 ?

 

Thank you so much again !