Use French Knot 
to place 
French knots that snap to half grid spacing. Each French knot is placed or erased with a single click.
French knots are only scaled in comparison to the full cross size when the Cross Size in Design Properties is set between 2mm and 4mm. The French knots will not be any smaller or larger than they are at these limits.
In the created embroidery, French knots are stitched at the end of the same color block as backstitch of the same color.
For designs with a cross size smaller than 4mm, it is recommended to only have one French knot per grid square, or an equivalent spacing. If the French knots are closer than this then they may overlap and produce excessively dense stitches.
When French knots are placed on the corners or edges of the design, the created embroidery will be larger than the design area. If the design is an exact hoop size, this means the embroidery may be too large for the hoop. Check the embroidery dimensions in the Design panel.
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