The feature to rebind the zoom in/out controls was added in patch 1.1.0 on PC. Please make sure you have the latest update on Steam, GOG or your store of choice.
No Camera Zoom In/Out Keybinding (PC)
The feature to rebind the zoom in/out controls was added in patch 1.1.0 on PC. Please make sure you have the latest update on Steam, GOG or your store of choice.