ORBI RBK53 Fails to Connect to Epson Workforce 845 Wireless Printer

Firmware on Router is 2.2.1.210  The Satellites are not the issue the Printer is physically adjacent to the Router (within 5 feet).  I have good WIFI Signal now throughout my house where previously it was spotty and required changing between multiple networks depending on whether I was nearer to Router or Extender  This is why I got Orbi Mesh System and it has solved those issues.  This appears to be just a problem with the Epson Printer failing to maintain a connection.  I assume it is probably because the 2.4 Radio chip on the Printer is older and does not support some of the newer channels above 11 while the ORBI is constantly trying to optimize to the best.  I did just use Auto but am unsure how to get to the setup that allows me to choose channels or other advanced feature setup. Sorry to be stupid but I cannot seem In the Orbi App to find where I go to do more advanced setup?  Sorry.  I am wired to Fiber Optic Network through a local ISP BRMEMC (Blue Ridge Mountain Electrical Management Cooperative) which provides Fiber Internet in my rural community.  I currently am not having problems with my Apple Devices, My Macs or anything but the printer.  

I am happy to answer all your questions regarding size of house (2700 Square Feet Appx.) It is a brick house that has been added on to 4 times all in Brick except for latest addition which is 460 Square Foot Sun Room in Hardy Board directly off the room the Router is located in and it has Satellite.  2nd Satellite is 2 rooms away in different direction with 2 Brick Walls between it and Router.  Again though I have fine signals in all parts of the home now and printer is literally 5 feet from the router and gets a signal from both satellites as well  ( it shows 3 devices with same name).

For every device except the Printer I am getting better performance than I did with my Nighthawk 1700 and Extenders and no longer have to constantly change networks as i move from room to room.  Is it fully optimized, probably not at this point.  But it is enormously better than I had before if I can just make my Printer hook up correctly.