In Autodesk Vehicle Tracking (AVT), you can edit the appearance of your swept path analysis. You can also use different layering conventions. But when switching these layering conventions off, there is no possibility to change layers (drop down remains grey). 
Also, it would be preferable to provide the same layer properties/options as the ones available in AutoCAD, including transparency. Now, you can add fills in the Vehicle Body envelopes, but they 'hide' all the info underneath them, making those reports unusable. AVT lacks options to make the solid fill of the body outline envelope transparent. You can only use 'hatchings' to 'simulate' transparency, making the analysis a 'mess' (see attachments of AVT and competition allowing transparency)
Please provide more flexible layering/visualising options.