Footprint Library Sources

ANY Library

PCB Doc > Footprint > Properties > Library > Any Library

Schematic Doc > Footprint Manager > Any

DBLIB Library

PCB Doc > Footprint > Properties > Library > DBLib Library

Schematic Doc > Footprint Manager > Use footprint from . . .  DBLIB

Tips:

Changing the Library source in the Footprint manager will NOT generate a change in a placed footprint where the footprint names match.

That's it !