You have to create two totally separate tax returns if you are filing as Married Filing Separately.
Only your income is entered on your tax return and only your spouse's income is entered on their tax return.
You both must use the Standard Deduction or you both must use Itemized Deductions.
Realize the filing separately is the worst way to file a tax return when married. See this TurboTax support FAQ - https://ttlc.intuit.com/community/married/help/is-it-better-for-a-married-couple-to-file-jointly-or-...
If you live in a community property state then filing separately is even more complex. See this TurboTax support FAQ - https://ttlc.intuit.com/community/married/help/married-filing-separately-in-community-property-state...
