To open the Edit Extrusion dialog-box, it is usually easier to identify and select a Pink (default) Profile Contour in the Mechanism-Editor.

However, if the you have imported a Solid from CAD, then it easier to select the imported Solid in the Model-Editor, and open the CAD-Line dialog-box.

Select the Profile and Extrusion in the Assembly-Tree or the graphic-area.

The image to the left shows many Profiles - all Pink - in the Mechanism graphic-area

1.Zoom in, with your middle scroll button on your mouse, and

2.Click the Profile you need to edit.

3.Review the Selection-Window

OPTION 1:

STEP 1: Click a Mechanism name-tab to make it the active Mechanism-Editor

STEP 2: Spin the View to show the Pink Profile contours in the graphic-area

STEP 3: SHIFT+ Click to select a Profile

STEP 4: Make sure the Profile and Extrusion show in the Selection-Window

STEP 5: Right-click the Extrusion in the Selection-Window

STEP 6: Click Edit... in the contextual-menu

Note: If you Right-Click the Profile element, you cannot edit it, but you can delete it.  This will also delete the child to the Profile - the Extrusion.

If you delete an Auto-Profile, the Extrusion and the sketch-loop are deleted.

OPTION 2: If you can:

STEP 1: Hover + Click one Profile/Extrusion

STEP 2: Right-Click the Profile/Extrusion in the graphic-area.

STEP 3: Click the Edit Element in the contextual-menu.

OPTION 3:

STEP 1: Click the Part that is the Parent of the Profile.

In the Assembly-Tree, the Part element shows with a square around the Element icon

STEP 2: Click the small triangle to expand the Part in the Assembly-Tree to reveal the Profile and Extrusion

STEP 3: Right-click the Extrusion and click Edit element in the contextual-menu

NOTE:

You can ONLY:

•Edit Extrusions

•Delete Profiles.

MechDesigner will also delete the Extrusion