Logitech K400 Plus Frequently Asked Questions Manual page 8

Key Shortcut / Function
FN + down arrow:
To select a function key, hold down the FN key, and then press one of the keys listed in the table
above.
For example, to use F5, hold down FN and then press the Search key
You can also set the keyboard to only use standard F1 - F12 functions. See
keyboard to use standard function keys
 +Disable keys on the K400 Plus keyboard with Logitech Options
You can disable some or all of the following keys on your K400 Plus keyboard:

Caps Lock

Scroll Lock

Insert

Windows logo key
To disable the keys:
1. Start Logitech Options:
Start > All Programs > Logitech > Logitech Options
2. If you have more than one product displayed in the Logitech Options window, select
Wireless Touch Keyboard K400 Plus.
3. In the lower left corner of the window, click More.
4. In the More Settings window, under Disabled keys, check the keys you want to disable.
5. Click on the X to close the window. Your changes are automatically saved.
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for more information.
Set the K400 Plus