Launch any app, or bring back the right ctrl key.

If you take a look at your laptop's keyboard, you'll notice that the top row keys have icons printed above, with "F" and a number, like F1, F2, and so on, below each one. These are known as function ...

For a function-key use that makes sense, but not for the sublegend for say = and + where they're both "valuable" keys. You get used to primary on the left, secondary on the right pretty quickly anyway ...