Oh, I think I understand what you are talking about…
It has to do with the type of pictures you are sending to be engraved…
Your first picture is a vector image…it does not have all of the options that the bitmap (photo or raster) image does. It is created using closed drawing paths with a fill color.
The second image consists of pixels…it’s a raster image (or bitmap).
You get more options with the second image, because the Photo Engrave settings automatically use “dithering” on images that have multiple shades of gray in them. Since the laser can only burn one color, it dithers the image to fool the eye into thinking there are different shades of gray for the photo…like old printed newspapers used to do. The more widely spaced the dots are, the lighter the gray color appears to the eye.
It’s always been that way. Any vector image with a fill color can only engrave in one “color”…solid black. So it doesn’t give you the options for dithering that a photo (raster) engrave does.
It’s pretty easy for photos though, just use one of the Photo Engrave default settings for your raster (bitmap) images. (And the software will default to that automatically if you save an SVG file that has a bitmap in it. SVG files can contain either bitmap images, or vector images or both. The software defaults to the correct kind of engraving for each part.)
If you need more of an explanation, there’s a short tutorial here that explains what’s going on: