Use ColorSort 
(Home tab) to reduce the selected embroidery(ies) or group to the minimum number of color blocks. The final number of color blocks produced in the ColorSort process can vary, depending on any overlap between areas. If possible, it leaves only one color block for each thread color used. If necessary, trims are added to connect the areas that use the same thread color. Unnecessary Color Change commands are removed.
It is usually recommended to use the ColorSort option in Export 
when creating an embroidery file optimized for stitching.
The ColorSort function in the Home tab is not available for single pieces of lettering, monograms, SuperDesigns or Frames.
If desired, click Undo
to return to the original colors.
If you use ColorSort on a multiple selection or group, the number of colors seen in the Color Select area may be more than if the same embroideries were combined. This is because ColorSort looks at the embroideries within the selection or group separately. To minimize the number of colors for stitching out, use Export with ColorSort to create a version for stitching.
Shortcuts
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Home Tab:
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Keys: Alt, H, CS