SHORT ANSWER: IT WORKS!!
LONG ANSWER: Where EXACTLY in this maze of menus and tabs will I find a two-sided material option? I have looked at everything I can imagine, and can’t see any materials with two-sided options. (and google can only find the two-sided lighting option)
In the World Outliner, I have a BP_LakeWater. The BP_Lakewater has details panel, but nothing there looks like a two-sided option. I click on the “Edit Blueprint” button on the BP_LakeWater details, and I get a new tab that shows the water blueprint, a Components TAB, and another Details tab.
The Components Tab has two items BP_Lakewater(self) and a sub-component called WaterSurface. Clicking on each one bring up different values in the Details Tab. Lots of stuff to read! Nothing about two-sided materials found.
So next I explore the Content Browser and try editing the M_LakeWater_01_Inst. It does not have a two-sided option. There is also a M_LakeWater_01 material, so I try editing that. In its Details tab, under Materials, there is a Two-Sided box. I check it and then go back to my project tab and press PLAY. Nothing! The water looks fine from above, but from below there is nothing there.
I stop the editor and go back to the M_LakeWater_01 material tab and close it. Now it asks if I want to APPLY the changes I made. Of course I do! Why did it not ask when I clicked play? or when I left the tab? Why not give me an APPLY button on the material? Oh Well…
Once it applied the change that I made I pressed PLAY, and IT WORKS!!!
Lesson learned? maybe… Now don’t get me wrong, I have been playing Eve for two years, so I am not afraid of the learning curve, but… how was a newbie really supposed to find this? I welcome a feature-rich UI, but how to find something new? Go tweak X? Do you mean A/B/C.D/E/F/X? You have answered a single question, but I am afraid I have not learned how to learn. I have tried googling “Two Sided” in the context of Unreal Engine, and did not find this checkbox. I found the lighting one instead. Is there a searchable list of ALL the tabs and parameters somewhere?
TL;DR: can the UI be made easier to search or discover without removing its power? Once I know where all these power tools are stored it will be great! In the mean time, this forum has fixed every problem I ran into… THANKS!!