Proof that I've installed it: "D:\Games\Others\Minecraft\instances\1.20.6\.minecraft\mods\bobby-5.2.0+mc1.20.6.jar"

Then, in game:

What's going on? It's supposedly to allow me to increase the chunks more than 32 with this mod, but it doesn't.

You need cloth config to go to the configuration menu in mod menu, where you can change the amount of chunks.
https://modrinth.com/mod/cloth-config
https://modrinth.com/mod/modmenu