Yes you can amend your taxes to switch from itemized to the standard deduction.
If you already filed and the return was accepted by IRS, you have to wait until you receive your refund before you can amend your taxes .
If your return is rejected or not yet submitted, you can edit any time and change to the standard deduction.
See this TurboTax support FAQ for amending a tax return
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
