Hi, as soon as I switch on the Mac address filtering, I can no longer connect my laptop to the Internet, but if it is not switched on, I can't connect all my other devices.
You shouldn't have Mac address filtering turned on.
When this is done, you should look at the other devices to see what problems are occurring locally.
Are the other devices on the same home network?
Does the network have the same name?
Maybe a device is not connected?
And what does the device display as an error when it wants to connect?
A Mac address is a physical address. Filtering or blocking them for someone means nothing other than kicking them out of the network.
Why do you want to change anything at any Mac address? (I hope you mean filtering the addresses in the router and not locally on the computer)