Disable Router Portion on C7000-100NAS

[djohn5663]

Trying to install a new EEROS 6+ Mesh Router System to my modem/router combo but need to shut down router portion to my Nighthawk. On my Nighthawk APP I cannot find setting to do this function. Any suggestions or instructions would be greatly appreciated. Thanks 

[FURRYe38]

https://kb.netgear.com/27191/How-to-set-the-cable-modem-router-to-be-on-modem-only