"wrap up tax breaks" appears in only some TurboTax editions (I think it's found in the Online products).
Back on the 2020 software, the charitable cash donation was implemented differently, given that it was a prime example of Congress "moving the goalposts" by making change after change even after tax season has started.
The way it worked (for me) in 2020 was that you
1. Added some cash (Money) donations under Charity (Schedule A).
2. When you had finished with your return, you confirm that you are taking the Standard Deduction. (usually, you don't have to actually do anything)
3. Run the Review. In the Review TurboTax will notice that you are using the Standard Deduction but that you also have some cash donations. It will ask you if you want to take this page 1 of the 1040 deduction. Enter your $300.
***Note: the limit in 2020 was $300, not $600 as you seem to think.
***The thing that was confusing about this in 2020 is that the item wasn't done until you ran through the Review.
***Normally, since you are taking the Standard Deduction, you don't have to bother going back and removing the $300 of cash donations - they are not affecting your return anyway.
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