I don't know how that happened in the first place, but to answer your questions...
Is there supposed to be 1 for every VM?
Only if you want them all to use host-only networking mode, and only if you want them all to be able to speak to the host but not to each other. This is a very unlikely scenario. You said you are running only a single VM at a time anyway.
Do I need them all?
Can I delete most of Them?
Some enabled some disabled?
They can be removed. They are all using a /16 subnet mask. The first 16 address bits are the same in all of them. In other words, the host has 19 different addresses on the same network. This is useless.
By default, you start out with a single host-only adapter, with an address of 192.168.56.1 and a 255.255.255.0 (/24) mask. If you were to create another adapter with, for example, an address of 192.168.57.1, and the same mask, both networks would be separate and contain the host and whichever guests you attach to each.
How do I enable/disable them?
You can't disable them (certainly not from the GUI). You can remove them though.
The only aspect of them than can be disabled is the DHCP server that automatically assigns IP addresses to the guests attached to that network.
How do I tell which one is for which VM? IE which one is for win11?
Look in the Settings for each VM. Go to the Network section and check what each adapter is attached to.
Also, if your VMs need access to the outside world/internet, you don't even want to be using host-only networking mode in the first place. You probably want NAT mode instead. For more advanced use cases, learn about the other networking modes here:
viewtopic.php?t=96608 and in the manual:
https://www.virtualbox.org/manual/ch06. ... rkingmodes