Sparrow Wallet question - mainnet vs testnet

I am planning on using sparrow wallet with my umbrel node. I have sparrow set up and connected to the node, but want to practice with testnet. Rather than change my umbrel node to testnet, I decided to install bitcoin core on my pc and sync it to testnet.

Can sparrow be linked to both simultaneously and switch between mainnet and testnet, or do I need to change the sparrow config file to point to the testnet chain when I want to use that?