check the node page on the alby hub. there you see channels, on chain balance, etc.
if a channel is closed for whatever reason it means that the funds become onchain available again. (lighting is the second layer to transact instantly)
that 0 is the spendable balance in lightning.
I know it’s sadly still more complicated than plain onchain or some custodial service that does it for you or some service like paypal…
but that’s the properties of lightning. all has upsides/downsides.