If it's like the linked pack, that is clearly listed as a split pack, two 3S packs. Note what appears to be a couple 3S balance taps. Some larger packs are made like this, as I understand it to step around a shipping regulation or something similar.

If both are connected in parallel, for example by connecting both positives and both negatives, that won't be a 6S pack, but rather a 3S 10Ah pack.

Need to connect them in series, like a saddle pack, to get a 6S.

Charging as a 6S is tricky, the balance taps must be connected correctly. Might be easier/safer to charge in parallel as a 3S pack.

In any event I'd recommend use of a volt meter to clear up any doubts. Seek hands on help if needed.