How do I hide the "Preview" watermark in my shadows?

" build the ue4 lightmass script manually", I’m not a seasoned programmer but I’m learning fast, but I have no idea what you’re getting at here, could you re-state that , knowing my level in this area ?

Speaking to that, given I’m not using dynamic lights, they are vastly too expensive , why would build lighting not just work as expected ? Is this you speak of, a ‘known’ workaround , and if so why…I also searched docs and found nothing to shed light on this…whatever you’re referring to I hope its the answer as I’m getting tired of this not working, about to go to another engine.Thanks in advance ofc, for your help.