How do you switch to your secondary weapon?

I have assigned a secondary weapon to my character. I want to switch to it and can't find the button to so it. The menu doesn't really provide much help either. The control section in the settings doesn't actually tell you the controls for the game.

Make sure you have a second weapon that is visible in the UI. Once it is, hold down the same button you use to reload (this button can be remapped). I believe it's square on the PS4 and X on the Xbox one. Hold this button down to switch to your secondary weapon.