You can just press “v” on your keyboard or go to the top of the Basic panel and click the “Black & White” option.
Converting to black and white in Lightroom is very simple. You can just press “v” on your keyboard or go to the top of the Basic panel and click the “Black & White” option. Both of these methods will allow you to make more adjustments to the conversion under the “HSL/Color/B&W” panel.