How do i change the Open/Close flags to the RCT1 style?

[Poisonjewel]

How do i make the open/close flags into the stop light style of RCT1? Is this only in the beta build or am i missing somthing else?

[jensj12]

Go to options -> 5th tab (controls and interface) -> pick a different theme (or edit themes -> select a theme to edit (original themes can't be changed, so you may need to duplicate one first) -> enable lights in the last tab)