In Rhino 7, after using shift + ctrl to select a series of sub-objects, I can use ctrl with mouse drag left to deselect all the sub-objects belonging to the object crossed by the mouse, even if the mouse drag window doesn’t include those sub-objects.
But in the latest version, Rhino 8.10, the functions of ctrl with mouse drag left and right are the same, then I have to make sure the sub-objects are inside the drag window so that I can deselect them.