The first, most basic step is to disconnect your keyboard from your computer, switch it off, turn it upside down, and thump its underside really well. Gently tap different parts of the underside and ...
You can change it from Settings or do it right in whatever app you're using Seems like every company has its own keyboard, and each one has a different layout. Then, you add specialized keyboards, and ...
You can set up a keyboard and mouse on your PS4 to browse the web and play games, but not every game will support it.