nighthawk MR63 mesh can not connect wireless with HP 4620 ALL IN ONE PRINTER

The usual way to fix wifi printers is to find the printer maker's utility, the software that runs on your operating system. Then use that to connect the printer to the wifi.

Installing HP wireless printer software | Wireless Printing Center | HP® United Kingdom

The router just broadcasts wifi. It is then down to the printer to play ball. There isn't much that you can do on a router, beyond fixing it to a particular IP address, that affects what the printer gets up to.

Where possible, using the WPS feature can simplify things.

You have posted your message in the section of this community given over to Nighthawk WiFi Routers. (This is easily done, given Netgear's complicated community structure.)

Many questions apply to different types of device, so you might get responses here, but you might get more help, and find earlier questions and answers specific to your hardware, in the appropriate section for your device. That's probably here:

Nighthawk Routers with WiFi 6 (AX) - NETGEAR Communities

I will ask the Netgear moderator to move your message.

In the meantime you could visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware.

You may have done this already. I can't tell from your message.