That meant that they were able to perform, as long as they had labor they were able to go between proscenium, thrust, flat floor, arena, traverse, you name it.
Das heißt: Sie konnten spielen, so lange sie Bühnenarbeiter hatten. Sie konnten zwischen Guckkastenbühne, Raumbühne, ebenerdiger Bühne wechseln, zwischen Arena, Korridorbühne, was auch immer.