Ctrl W does not extend

In C# course Mosh states use Ctrl W to select a line and then he demonstrates that this can be extended to more than one line.

I can not duplicate what he talks about in the course. When I use Ctrl W with the cursor at the right of the line it only highlights the last letter of the line, when I use Ctrl W with cursor at the left side of line it highlights the area before the first letter of the line. I can not figure out how to highlight the entire line or extend the highlight to more than one line. How is this done? Thank you.

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I also meet this problem, after search on google,I still can’t find the solution.
Just use shift up/down arrow.