Help! Switching from Windows to Mac and struggling with keyboard commands (Logi K680)

Good day, I recently switched from Windows to Mac, and to be honest, the transition hasn’t been that easy. In particular, I’ve been having a lot of issues with keyboard commands. I’m using a Logi K680 keyboard, and I can’t get the **(fn)** key to work properly. While this key is integrated between the **CMD** and **OPT** keys on the right side, it simply doesn’t function when I try to use it for window management tasks like resizing or moving windows. [if I press on my KB it simply doesn't work](https://preview.redd.it/w1idijf92c7e1.png?width=301&format=png&auto=webp&s=90816fbf364049b58d0cc5099ae5ae45c7007c25) Can anyone guide me on how to fix this? Adjusting my windows directly from the keyboard is a basic function for my daily workflow. Thank you so much!