The orders folder usually created in the folder with config.yaml. If you used a binary from a docker image, then check where is orders folder is located.
You can stop the storagenode and move orders to the disk with remained storage and specify the path to it in the config.yaml, for example:
# path to store order limit files in
storage2.orders.path: /root/.local/share/storj/local-network/storagenode/0/orders