Minecraft version: 1.21.4
Modloader: Fabric
Fabric loader version: 0.16.9
Environment: Singleplayer

Mod name: Realistic Bees

I've changed the hive space between 9 to 20 in both the in-game mod setting menu, and via the config file, and neither change the hive space. Changing the config file correctly updates the number specified, however hive space continues to remain at 3.

Thank you for opening the issue and giving the mod a try! This has been fixed in version 4.2 of Realistic Bees. Apologies for the inconvenience.

https://curseforge.com/minecraft/mc-mods/realistic-bees/files