Married Filing Separately

No you can switch each year.  

See this article on how to file a joint federal return and file separate state returns…..
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-joint-federal-return-and-separate-state-returns/00/25564

You need to do 3 separate federal returns. One for Joint and 1 for each spouse to do the mock separate federal return to do the separate state returns.

If you are using the online version it will be cheaper and easier to do it in the desktop version. Contact Customer Service to give you the desktop program download.

Reading the FAQ it looks like you have to use 3 accounts. One to file the Joint return. Then you each need another account to fill out fake federal MFS returns to do your separate state returns. So you will have to PAY for 3 online accounts (3 federal returns and 2 state returns). That's why it's cheaper to use the Desktop installed program. If you don't have a computer to install the desktop program on maybe it would be cheaper and easier to go to a local accountant or tax place.

the recommendation is to use desktop software to do all the returns. and in the long run may be cheaper.

if you really prefer to use online then the spouse would have to create a second account (using the joint a/c for the other spouse MFS  return will permanently overwrite the joint return so it will not be available for 2023) . create a federal married filing separate federal return and then can prepare the state which would have to be mailed.  then there would also like be a second set of fees