What I want to do is to be able to do things on my Windows 11 Pro [PC], and then switch over to using my LinuxMint [Cinanamon flavor], without having to plug-in another HD in for this.
Yeah, you don't really need a VM for this when you can resize partitions and dual boot, but it's certainly possible
As hinted above VM means various things (the motherboard is emulated, the CPU isn't by definition, traditionally everything else is and that's still the default but support for directly assigning real hardware that you're not using on the host OS is more and more common), if you simply want to have a "secondary" OS in a fairly hassle free and easily removable way feel free to ignore this capability and use a standard disk image and simulated keyboard/pen-tablet/graphics/sound/network setup, in fact I would say the ability to use a real disk is relatively hidden on many pieces of VM software...
The best thing to do is to have a dedicated drive for each OS on your system. So, one drive for Windows, one drive for Linux. Install them separately (NOT multiboot). Then you can switch between them by choosing your boot disk in the BIOS at boot if you want to boot either of them bare metal.
In a BIOS system (where multibooting has its limitations, especially when you're not using the first HDD, whatever your firmware considers it to be) that's a good advice, but in an EFI system there ought to be only one EFI partition
(not that most implementations don't let you get away with multiple) and all the bootloaders placed there, regardless of how many disks you spread the other stuff on
If I recall correctly, there are some limitations on the resolution of the virtual machine in Hyper-V. What I actually did was install an X server in Windows, which allows you to create a reverse ssh tunnel to the virtual machine with X forwarding. Then you can launch Linux GUI apps on your Windows desktop pretty seemlessly.
Never tried it but I think WSL does automatically (another alternative, even though it's a rather original implementation of a VM!)
Not sure if Linux even uses ext3/4 anymore, or X.
Sure, ext4 is still the most common Linux filesystem (and therefore the most real world tested), just like there are plenty of others with their pros and cons, X is also still a thing (
although not the same as it was) for people like me who won't accept a half baked substitute that deliberately does less "for your security" and currently fails to solve the #1 criticism of X in the first place (fragmentation due to being a bunch of extensions to a now weak, citation needed, base standard)