In DevMode Options there is an option to Display Position which used to work for me but now neither Display Position or Display FPS will work. If I need to reinstall SDK 0.16.0 do I need to uninstall it first and if so how?

In DevMode Options there is an option to Display Position which used to work for me but now neither Display Position or Display FPS will work. If I need to reinstall SDK 0.16.0 do I need to uninstall it first and if so how?