recovery mode pixel p5800 .which button is "enter key"?

In the pixel p5800 gamepad, when you're in "Recovery Mode", Volume Up & Down is used for scrolling. But which button is referred to as Enter Key to select?

I could not find the "Enter Key" that I needed select that option after scrolling to "wipe/factory reset" and my Tab won't boot fully either.

I need these answers quickly to get my Tab working. At the moment, the Tab hang on the opening Logo.