Hi DocRogers,
Here is a simple video I made a while back when someone was having trouble setting it up.
This is the process.
Any other information can be found here in the documentation: Lighting the Environment in Unreal Engine | Unreal Engine 5.1 Documentation
This is NOT a production ready tool yet. There are going to be some known issues with it, but there are some changes coming from Lionhead Studios that should be implemented in the future to make it better overall.
With regards to Lightmass. It is not “disabled” per se, but it won’t do anything. If you click the build button it will still start swarm agent and finish very quickly since there is no static lighting to be built.
If you’re going to use a fully dynamically lit project, you will want to go into the Settings > World Settings > set Force No Pre-Computed to True. This will disable any static lighting.
I hope this helps.
Tim