If I took out all my roth ira and closed my account. What do I enter at "Enter Prior Year IRA Contributions"?

The question is asking how much money you contributed to the account prior to 2024 so that the taxable amount of what you took out of the account can be calculated.

Enter the total amount of money that you put into the account through the end of 2023.  Do not include anything that was contributed to the account during 2024.  

If the total amount you took out when closing the account is less than the total amount you put into it (minus any prior distributions), then the distribution when you closed the account would be non-taxable.  

If the total amount you took out when closing the account is more than the amount you put in (minus any prior distributions), then the difference is considered to be taxable income and could be subject to an early distribution penalty as well.