Hello,
You can always switch to a different deduction, but it's best to hold off on switching until after you've finished going through the Deductions & Credits section. That way you can get an accurate picture of how both deductions affect your bottom line.
For detailed steps on how to switch, check out this article: https://ttlc.intuit.com/community/accessing/help/how-do-i-change-from-the-standard-deduction-to-item...
