Are hidden defaulty widgets loaded in memory?

I created main root widget where I placed all my ingame widgets and all these widget I marked as hidden. I will show concrete if required.

Question: these widgets loaded in memory always?

Before that I using command Add To Viewport fucntion to add widget, but this method blocks previous widget to mouse events, and this is not good.

Staff, please tell me about details about using UMG at this target.


Much thanks, Epic!