Home network computers aren't shown in Windows Explorer

Glad you got it going with all the "distraction".

not all computers will show in the Network window

you can check out the network connection/adapter, properties, ipv4, properties and check under advanced, WINS, whether NetBIOS is enabled. NetBIOS is necessary to help the PCs "discover" each other on the net.

There should also be a second tab "alternative configuration" on the ipv4 properties. This may help you with the hotspot in case you run into trouble with it in the future. Don't use it unless you really have trouble ;-)

Also, make sure that your network is set as a "private network" (and not a public one) in Network Connections.

In case you use accounts with admin privileges you may also be interested in administrative shares: https://en.wikipedia.org/wiki/Administrative_share

I agree.

But, when you have not configured it yet, and wonder why it does not wake other PC's when you try and access them after they have been idle and you had the modem power off, and wonder why you have to restart the PC's and what not, is clearly obvious that is part of his problem for that.

Next, if he has the issues connected to PC's on his network in v1803, then you will get access denied every time and must use shortcuts using PC IP ADDRESS. And then does he have his shares set up properly. Has he only used HomeGroup like many others and have no clue how to now share on the Network without HomeGroup.

And then he has people telling him to make all these changes on his PC and Network to further his problems, when none of it is the problem.

I do this everyday. I have not once had to alter anything on a home or business network or their PC's, servers or Domain settings.

Once he sets up his network and it works, then he can power off his modem. But when he starts it up again, then tries to access another PC through the network, it might not do it until the PC's are restarted. I have seen this a million times over again. It is ELEMENTARY TO ME.