Some people may get annoyed with Fusion 360 auto projecting edges during profile creation within the sketch environment. I’m talking about the magenta lines which appear when you mouse over an edge that doesn’t intersect the sketch plane. As opposed to the edges which do intersect it and therefore automatically include themselves within the profile calculation during a modelling operation.

Disable Fusion 360 Auto Projection

So how do you disable Fusion 360 auto projection for edges? There are two ways:

  1. Turn the feature off permanently within the Fusion 360 Preferences.
  2. Prevent the projection temporarily.

Disable Fusion 360 Auto Projection

This only takes effect on model edges which aren’t planar with the sketch. Another thing to consider is these edges only get projected if the current view is normal to the sketch plane. So in other words, if you rotate the model so your sketch isn’t flat on your screen, then those edges won’t project anyway.

  • Expand the menu under your Autodesk ID in the top right corner of Fusion 360
  • Select Preferences
  • Under General, highlight Design
  • Disable the Auto project geometry not in the active sketch plane check box.

Turn off Fusion 360 Auto Project Edges

Temporarily Disable Fusion 360 Auto Projection

As is often the case in several popular CAD applications, the CTRL key is super handy when it comes to selections, it often disables other application behavior temporarily as well. Fusion 360 is no exception, check out the video below to see how to temporarily disable Fusion 360 Auto Projection. Look out for the magenta projected edge when the CTRL key isn’t used, and lack of it when the CTRL key is.

Disable Fusion 360 Auto Projection