UE4 4.26 preview 7 no fracture mesh tab

I activate plugins chaos but after last update cant find mesh fracture tab, what is going on?

chaos is not available in epic launcher version of the engine from 4.26preview7. Even if you compile from source you will have to enable to by following the documentation. It will only be enabled next year with the next version as lot more work is need to make chaos in the same level of physix.