When I use a construction line, I lock it. I do this so it will not only remain in place but also will not interfere with profiles but also to remain if I need to window select some mess for deletion but have my guides remain. As far as I understand ‘fix/unfix’ which is displayed with a lock icon that can be expected. However in Fusion the locked objects are easily selected and deleted. Like wise trying to select a profile curve that collinear with a construction curve necessitates additional ****ing around to get the desired line. Of course the construction lines must retain some interactivity to serve the sketch engine but is it not possible to achieve both? How long would it take to implement this refinement? 3-4 years? Is this expectation ‘out there’? WTF?