video=https://pixeldrain.com/u/hEph97LE
Placing blocks feels odd and unfamiliar. I want to remove this mod, but I'm not sure what it's called
"I want to revert to the original behavior of block placement."

To disable this feature go Mod Options ➜ Universal Tweaks ➜ Tweaks ➜ Blocks ➜ Better Placement ➜ Better Placement Toggle set false.