How to change f(x) to testnet in mobile app?

Questions
1

I’m using f(x)Wallet (1.8.0 release) on Android, and in General/Network configuration I can see Testnet network for Bitcoin and Ethereum, but I cannot see Testnet for f(x)Core and PundiX.

2

You can’t using the regular app.
You Can only do that with the beta app.