F4 on Lenovo is not repeat command

[MJ Papa]

I'm accustomed to using F4 to repeat last command. I just bought a new Lenovo, and F4 mutes the sound. Does anyone know the repeat command on Lenovo? Excel is Excel. IDK why they would be different. Thank you

 

[RoryA]

If you had just closed a workbook, then Ctrl+y would attempt to repeat that action - ie close the current workbook. The saving prompt would be a consequence of that if it was currently not saved.