Problème de Gravure floue (Fuzzy Engraving Issue)

The engrave speed setting is in the Cuts / Layers Window.
If it is not showing, click Window, and scroll down to select Cuts / Layers.
If the check mark is already there, the window is Active and may be on the screen or on a tab under another window.
In the Cuts / Layers window, double-click the layer that you would like to adjust.
You may find that the ‘blurr’ is caused by incorrect ‘Scanning Offset’
This page should translate reasonably well.