Configuring OpenWrt as internal network using 10.x.x.x subnet

I have a router for my house to connect to the Internet. I purchased a new TP-Link AC1750 Archer A7v5 router to create an independent network inside my main network using a different subnet (10.x.x.x) I have OpenWRT installed with the WAN configured via DHCP from my main router, but when I try and change the IP range for LAN from 192.168.1.1 to 10.1.1.1 (with accompanying netmask), the change will not take and is rolled back.
Can someone please help me understand the configuration I need to accomplish my goal?
Specifically:
External/Primary network - 192.168.1.x
Internal WRT ArcherA7v5 router network - 10.1.1.x
The 'Device' under Interfaces -> LAN is currently BR-LAN (Bridged)
Any and all help is greatly appreciated. My grasp of terminology is less than ideal, so if this is something I could have googled easily enough, I apologize, I am still figuring stuff out.

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Ahah. Testing now. Thank you!
I had thought it was odd; the config is pretty straightforward, but the warning is pretty intimidating.
I'll post the outcome in a few minutes.
Thank you Psherman. 42 Wallaby Way, Sydney
Couldn't resist.

Solved. Thank you PSherman!

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