I use a software which requires keyboard shortcuts on the NumPad. The number keys above the keyboard won't work. On a MacBook Pro, I used to be able to open the on-screen Keyboard Viewer and click on the keys, but it's not working in Mojave. Now the on-screen keyboard mirrors the laptop keyboard, and only shows the NumPad if I connect a full-size USB keyboard. How can I get the full-size virtual keyboard back?