[v6 General Discussion] Font size

I would like some explanation on the font size, as defined in Easy Worship.

A fixed font size leads to different results (size), depending on the resolution of the attached monitor or beamer.
So it appears that the font size is not defined in relation to the screen size.
So how can we be sure that the text on the screen is displayed when we prepare the slides "offline" (on a laptop that is later connected to the beamer)?
We can use the option "resize text to fit the element" in the editor, but in that case it is still not clear how to finetune the layout.