Hi!
Red color in the preview window means the surface area is overexposed, blue underexposed.
You are overexposing which introduces artificial artefacts. Use “auto” button or adjust the setting manually (probably the lowest setting needed).
Also back couple of cm so the object is more in " excellent" range than “too near”.
How did you fuse and mesh? The highest setting aren’t always the best. The less details on the surface, the lower settings for fusing and meshing/grid size (should be the same !) you should use for smoother appearance afterwards . Otherwise you only induce more noise and artefacts on the surface in the postprocess (fusing, meshing)
Some surface might have perfect properties regarding reflectivity of projected laser pattern, but not all. This then causes more of less of microscattering of the laser which you see as noise afterwards.
Therefore depending on surface you need to optimize it by using some scan spray - there are different options, also DIY. Please search the forum , it was discussed maaaany times.
Let me know if this helped with your scan results.