You can switch back to the Standard Deduction by taking the following steps:
If you go to Deductions & Credits, click I'll choose what I work on, and then scroll down to click Done with Deductions.
You will have to click through
a few screens, such as the summary screen for
your deductions and credits.
The Standard/Itemized deduction screen should come up soon after, along with a small
box to check if you'd like to change your deduction from itemized to standard.
If this does not fully resolve
your question, kindly post additional details below.