This article describes a feature marked as legacy—this usually means there's a newer, better alternative. Legacy features might not be removed but they will not be updated, and the team will not provide any support for them.
Component image
Legacy Feature Settings component as seen in the Scene Inspector
The LegacyFeatureSettings component is best described on it's page, Settings.
This is to make certain features like posers that hijack feet proxies work, without having to modify them.
If you turn this on without using posers or similar features, the animations will NOT look correct. Turn this off after you’re done using posers.
This will likely be removed at some point, we recommend upgrading posers to be compatible with the new system and automatically suppress the simulation when active.