The Accidental Microphone
macOS includes a powerful, system-wide Dictation feature that allows you to speak to your Mac instead of typing. By default, Apple sets a global keyboard shortcut to quickly trigger this feature, usually by rapidly pressing the “Control” key twice or pressing the dedicated microphone key (F5) on newer Apple keyboards. If you are a fast typist, a heavy user of keyboard shortcuts, or a gamer who frequently taps the Control or Function keys, you might find that you constantly trigger Dictation by accident. The screen dims slightly, a small microphone icon pops up, and your Mac begins automatically recording your background noise, interrupting your workflow.
Disabling the Dictation Shortcut
To eliminate these accidental interruptions and stop macOS from automatically starting Dictation when you press specific keys, you must either change the shortcut or disable the Dictation feature entirely.
Click the Apple logo in the top-left corner of your screen and select System Settings (or System Preferences on older versions). Scroll down the left-hand sidebar and click on Keyboard. In the main Keyboard panel, look for the section labeled Dictation. If you never use the feature and want to ensure it never turns on, simply toggle the master switch next to Dictation to the Off position. However, if you still want to use it via menu bars but just hate the keyboard trigger, leave the main switch On, and look for the dropdown menu labeled Shortcut. Click this dropdown and select Off (or choose a much more complex, hard-to-accidentally-hit shortcut like “Press Left Command and Right Command”). The microphone will no longer appear when you rapidly strike the control keys.