How to configure my tile settings

Hi, i m kinda new player on rimworld and i just realized i placed my colony wrong tile (sorry for bad english) and now my tile's growth period is 40/60 and that makes game so hard to me. Why i m not going to start a new save because i player a lot actually and i dont wanna lose my progress. Can anyone help? (If there is a mod allows the configure i can use it too)