You can change keybinds by pressing "Keybinds" button in the bottom right corner of the game, or by going to "C:\Users\<username>\AppData\LocalLow\Orsoniks\CasualtiesUnknown\keybinds.json", there's a keybind "console" that is set to "backquote", you can look up keybinds name in Unity and change it to something else, then you would need to press "Reset binds (Check for changes)" button in the game (right under "Keybinds" button)
Hope that helps! :3