Click Stitch Optimizer 
to improve the stitchout of the embroidery, both in speed and quality. One of the effects of the Stitch Optimizer is to remove unnecessary short stitches. The Stitch Optimizer only affects visible stitches. A confirmation message appears that shows the number of stitches removed from the embroidery.
Feel free to try using the Stitch Optimizer on most embroideries, especially after changes have been made to an embroidery, before saving the final result. However, the Stitch Optimizer only optimizes an embroidery once, rather than making progressive changes to the embroidery.
to change the settings used by Stitch Optimizer. This is recommended only if you feel that stitches have been removed that affect the look of the embroidery. Changes to Optimizer Preferences are very rarely needed.
By default, Stitch Optimizer is also used automatically after using Resize.
Cutwork Needle lines in the Inspira Cutwork Needle "thread range" and Felting Needle Colors in the Inspira Felting Needle "thread range" are unaffected by Optimize Stitch Length.
Use Stitch Optimizer before using Export 
, or as part of the Export process. See Export.
Shortcuts
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Modify Design, Modify Tab:
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Keys: Alt, M, S