Unable to change subnet for TrueNAS

Maybe there is something I'm missing that's super obvious (real tired today) but is there basically no easy way to move a TrueNAS server over to another subnet?

I'm currently trying to adjust mine so it's in a new subnet, and I can change the interface IP address as you should, but I can't change the default gateway at the same time as it says it's not reachable. Meaning that once the new IP address on the interface is applied TrueNAS has an incorrect default gateway and therefore can't be...

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