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For the question "Can I ask a question that via pads don't have connections?", I want to say something.
I am working with 4 layers for a rigid-flex design. According to the 3D viewer when you place a through via, Kicad places pads or rings around the via
You can right click the footprint, chosse properties and change the local settings of pad clearance.
Can I ask a question that via pads don't have connections?
My suggestion is that setting the clearance on a pad by pad basis, either in the footprint editor or after placing a footprint on the board.
Quite good posting. Your knowledge is quite impressive and useful to me who is new beginner. Hope you can write more posts and I will keep on reading.