Undo - Build Lighthing?

How can you actually undo a Build-Lighting option? :eek:

Hi, try going to world settings->Lightmass->Lightmaps under them there is a checkbox “Force no precomputed lighting”. Then, as the notifications says, Rebuild. Hope this is what you are searching for. The lightmaps still show up in the engine but they are not displayed…

i have the red text of (Lights need to be rebuild) i did rebuild from build > build lighting only . Now i want to Undo that how can i do that.