2 Netgear routers side by side?

> [...] Nighthawk Tri-band Mesh WiFi 6 System 3.6Gbps Router + 2
> Satellites.

   None of that is a model number.  Find an actual model number on the
router product label or package.

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual (at least).  Read.
Look for a topic like "Set up the router as a WiFi access point".

> [...] Can I disable DHCP on the Mesh router?

   Configuring it as a wireless access point would do that.  Among other
things:

      https://kb.netgear.com/26765

   Simply disabling the DHCP server should also be possible, but is
almost certainly _not_ what you want to do.  Look in the User Manual for
a topic like "Disable the DHCP server feature in the router".  (But
don't do that.)