Does a living/grantor trust become a simple/complex trust after the grantor dies? (Form 1041)

The grantor of a living trust is now deceased. The trust now has it's own EIN. Most of the trust assets were distributed to the beneficiaries in 2023. I am trying to understand the correct trust type(s) to check on Form 1041. Is it correct that while it was a grantor trust (when the grantor was alive), it is considered a complex trust now since assets were distributed in 2023? Does the grantor trust box also need to be checked?