When you use the Married Filing Separate filing status there will be a series of questions that you must answer in the Personal Info section of your return. One of these questions will ask whether your spouse or you claim itemized deductions. Checking that box will lock your return into claiming itemized deductions and you won't have to worry about changing it later.
As mentioned by Champ xmasbaby0, there are some drawbacks to using the Married Filing Separate filing status, but there are also valid reasons to do so.
@lkng67
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