Follow on after reading more on UTM and how to remove a UTM Virtual Machine file
Launch the UTM application on your Mac.
Locate the VM: In the UTM interface, find the virtual machine you want to remove.
Right-click (or Control-click) on the virtual machine.
Select "Delete" from the context menu.
Confirm the deletion when prompted.
Remove Image Files (if necessary):
Go to the folder where UTM stores virtual machine images. This is typically in ~/Documents/UTM or another designated directory.
Locate the corresponding image file (usually with a .utm extension) and move it to the Trash.
Empty Trash: To permanently remove the files, empty the Trash.