Kicad 6 - testing vias on a 4 layer board

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Joined Jun 21, 2009

I am using Kicad 6.
I initially have a 2 layer board, then I switch to a 4 layer board to add a ground and Power plane.
After pouring copper for both GND and PWR planes, does my throught holes components automatically connect to their appropriate layers ?
How do I test the PADS of the components to validate if they DO go to the desired layer ??

Also, I can see the trace line on my PCB which I would normally use to route between two points. So I routed a short line then added a blind via to the target layer. I thought the trace line would disappear but it does not. I am supposing there is something wrong with the via.

Thank you.

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