The harder way: query the objects with PCB Filter, or look them up in PCB List (list by type 3D Component Body).
Querying does nothing by itself, but can select things faster and more specifically (downside is the huge learning curve). List and Properties can edit objects. You can even enter arbitrary transparency in List (used to be able to in Properties too, until they revamped the panel in.. AD18?).
Find Similar Objects is a good way to introduce yourself to the query system, just tick Create Expression. The references are... alas, a bit piecemeal, but the query builder is helpful.
Tim