Well your "line width" parameter appears to be around 0.4 and you have it looks like a wall width of at least 1.2 (3 shells). So you won't get any "top layer" as you call it. You could lower the wall width to 0.4 and then you won't get any of those green shells. Just the red outer shell and then filled in with diagonal yellow "skin".
However there are other things you can do to improve the top. You can use the "ironing" feature. Or I recommend getting the burtoogle version aka MB version of Cura here which does a really good job of thin parts like your text here:
The default settings will give you a more filled-in top layer (in real life - it's not as obvious in preview mode).
Did you actually try printing these things? I bet they look better in real life than they do in preview mode.
Also know that inset letters usually come out better than letters sticking out of the part.
PS: This condition is not unique to letters...it was just a quick, easy example to display my results. I do have some extruded rectangles in my actual model that show the same problem...no top layer, not filling, and holes.
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