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Why would ipv6 Loopback Adapter traffic be active in Wireshark when I have the IPv6 disabled on my Windows 10 laptop

"Disabled" in what sense? Do you mean that IPv6 is completely disabled everywhere, or just on your LAN interfaces? If it's just on your LAN interfaces, that's irrelevant, as this is traffic on the loopback adapter, meaning it's traffic sent from a program on your machine to anther program on the same machine, where that traffic is not sent on any real network adapter, it's just being moved around inside the machine, so it's not sent on any of your LAN interfaces.

and in my router.

Given that this is traffic on the loopback adapter, it's not sent on any network adapter, so it is never seen by any other machine on your network, including any routers on the network so the router is irrelevant here.

How can I use Wireshark to find the real device connecting to my computer, looking like it is my computer.

There is no real device connecting to your computer, it's just traffic from one program on hour machine to another program on your machine.

Perhaps the program sending the multicast packet is sending it from all addresses, including the IPv6 localhost address.

Why would ipv6 Loopback Adapter traffic be active in Wireshark when I have the IPv6 disabled on my Windows 10 laptop

"Disabled" in what sense? Do you mean that IPv6 is completely disabled everywhere, or just on your LAN interfaces? If it's just on your LAN interfaces, that's irrelevant, as this is traffic on the loopback adapter, meaning it's traffic sent from a program on your machine to anther program on the same machine, where that traffic is not sent on any real network adapter, it's just being moved around inside the machine, so it's not sent on any of your LAN interfaces.

and in my router.

Given that this is traffic on the loopback adapter, it's not sent on any network adapter, so it is never seen by any other machine on your network, including any routers on the network so the router is irrelevant here.

How can I use Wireshark to find the real device connecting to my computer, looking like it is my computer.

There is no real device connecting to your computer, it's just traffic from one program on hour your machine to another program on your machine.

Perhaps the program sending the multicast packet is sending it from all addresses, including the IPv6 localhost address.