The playtest material for the 2024 core rule book revisions can be found here: https://www.dndbeyond.com/sources/ua. It hasn't ever been integrated into D&D Beyonds tools however.
No plans have been announced for re-integrating unearthed arcana into those same tools
When will the UA/One D&D content be available again on D&D Beyond?
D&D since 1984
The playtest material for the 2024 core rule book revisions can be found here: https://www.dndbeyond.com/sources/ua. It hasn't ever been integrated into D&D Beyonds tools however.
No plans have been announced for re-integrating unearthed arcana into those same tools
Find my D&D Beyond articles here
That makes playing with it significantly harder…