To use the Logitech mx keys function keys as standard F1-F12 keys, press Fn + Esc once. This instantly locks the top row into standard function keys, so pressing F5 will refresh a page, and you will need to hold the Fn key to access the media or hotkey functions.
How to use Logitech mx keys function keys as standard F1-F12
By default, the function keys (F1, F12) on your Logitech MX Keys are configured as media keys or special hotkeys. A single press activates their secondary function, such as volume control or brightness adjustment. To use the standard F1, F12 functions, like F5 to refresh, you must hold down the Fn key while pressing the desired F-key.
The immediate solution is the Fn + Esc key combination. This acts as an Fn lock or Fn toggle, switching the primary function of the F-row keys. When Fn lock is enabled (standard F-keys are primary), you will need to hold the Fn key to access the media or hotkey functions. Press Fn + Esc again to revert to media keys as the primary behavior.
Customizing the F-row with Logi Options+
You can customize the default behavior of the function keys and assign custom actions using the Logitech Options+ software. This software is compatible with Windows 10 or later and macOS 10.14 or later.
- Download and install Logi Options+ from the Logitech website.
- Launch the software and ensure your MX Keys is connected and recognized.
- Select your MX Keys from the list of connected devices.
- Navigate to the function key settings section.
- Assign specific functions, shortcuts, or application launches to any F-key, replacing the default assignments.
- Apply and save your settings.
While the Fn + Esc toggle works without software, installing Logi Options+ provides on-screen notifications when you switch between modes. Basic keyboard functions, including the Fn key toggle, are supported on Linux, ChromeOS, and iPadOS without the Logi Options+ software, but customization features require Windows or macOS.
Essential Fn key shortcuts for your MX Keys
Logitech keyboards have specific Fn key shortcuts that are critical for switching between operating system layouts. Press Fn + O to switch to a Mac keyboard layout and Fn + P for a PC layout. When the software is installed, these combinations trigger on-screen notifications to confirm the switch. For a complete reference, the keyboard keys explained section in the Logi Options+ help menu details every available Fn combination.
Troubleshooting function key problems
If the Fn + Esc toggle is not working, check for conflicting software that may be intercepting the key combination. Ensure Logi Options+ is running if you rely on its customization or on-screen notifications. Clean the keyboard with compressed air or a soft brush to remove debris that may interfere with key presses. Restart your device to refresh system settings and resolve temporary glitches.
For the wider topic, see keyboard keys explained.
