@Frankyg This is a pretty common situation where some states allow some flexibility. When a state does allow a filing status change you'll see the option available in Screen 3, Miscellaneous, as well as additional input options in Screens 55, Part Year Residency.

Connecticut doesn't offer the filing status override in Screen 3. However, there are some nonresident part year resident entries in Screen 55 that I'm testing for you.