Yeah, this keyboard has it too. But not all devices remember. And that's the problem. Sometimes it's software on the PC that controls it, other times it lives in the keyboaed. But some devices are stupid and will forget when you disconnect/change devices.

There's also often a BIOS setting that changes the default behavior of keys that have alternate functions with the FN key.

I mean, the solution is pretty simple, here: remove both function and media, etc. keys. That way, no extra keys to press (in fact, no keys, at all).

This design stuff's a cakewalk~

To be fair it should be an easy fix, make the "Fn Lock" function a hardware switch, everyone gets to choose their preference without installing any bloatware

Weird, I’ve got a few and never had issues with the signal! If you have the option, use a USB2.0 port on your mobo instead of a USB3. I’ve had issues with interference with other devices when I used a USB3 port for wireless peripherals.

I’ve never experienced that! I have a bunch of K400s I’ve built up over the years for all the different computers we have around the house. No Cortana ever happens, but all of all of our machines are Windows 10, Linux, or Mac, so it might be a windows 11 thing?

TKL is basically the same as a laptop keyboard, which up until about 10-15 years ago always had a numpad overlaid on top of the letter keys below the 7, 8, & 9 keys and activated by pressing the NumLoc key. I'm guessing manufacturers stopped including the feature due to more and more non-technical users using laptops, and confusing themselves by accidentally turning on the NumLoc (business-oriented laptops often still have them). The image I linked to above is from a page explaining it on a website related to the once-popular "For Dummies" series of books & they have an example of what happens when you type with it off vs on.