It’s a bit of a hassle, but you can go into System Preferences…Keyboard and select the box that says “Use all F1, F2, etc keys as standard function keys”. This is basically a “Function Key Lock” setting.
When you have your system setup this way, you don’t have to press the fn key in combination with the function keys. Just press the appropriate function key (F1 - F12) to perform the action (e.g. F10 to take a picture).
The downside to enabling the setting is that you can’t perform the shortcut actions that are on the keys (e.g. F10 for mute). I tend to setup my volume prior to my Zwift session, then change the system setting to enable function key locking.