In most cases when you are married the best way to file a tax return is Married Filing Jointly.
Filing as Married Filing Separately is the worst way to fil when married.
See this TurboTax support for filing jointly versus separately - https://ttlc.intuit.com/turbotax-support/en-us/help-article/taxation/better-married-couple-file-join...
See this TurboTax support FAQ for how to switch from filing jointly to filing separately - https://ttlc.intuit.com/turbotax-support/en-us/help-article/small-business-processes/switch-filing-j...
