So, use the correct key to enable function keys and then use the F5 key to refresh your desktop or a page. See: Keyboard Volume keys not working in Windows.

How To Use The F Keys On A Windows Laptop On a Windows laptop, function keys typically provide two distinct sets of commands: Primary/standard and secondary/alternative.

Function keys that enable convenient features like instant browser refreshing or screenshotting pages are lost unless you hold down the “fn” key on your keyboard.

Press "Fn-F8" to change your computer's wireless connection from Wi-Fi to Bluetooth and back again. Press "Fn-F9" to disable the mouse touchpad. Press the buttons again to enable it.

Press F10, and small letters appear over each ribbon tab and quick access toolbar item. Alt+H takes you to the Home tab, Alt+N to Insert, and so on. Once in a tab, additional letters appear for ...

1] Use the dedicated keyboard keys If your Acer laptop has a dedicated Function key to enable and disable the touchpad, you might have pressed it accidentally due to which your touchpad is disabled.