Constraining or defining 3 point arcs

I traced a dragonfly using the 3 pt arc tool, however i am unable to fully constrain the design. or get the red padlock on the sketch. or the lines to turn black. very new to f360. watched several videos however could not find the remedy

There’s a lot of videos out there which focuses on the need for constraining, I find for doing simple plasma art fully constraining it is not necessary. I do a lot of my plasma sketching without fully defining it.

Just get to a point in your sketch where you can extrude what you want to cut into bodies and you’ll be well on your way. Don’t focus on fully defining these kind of designs.

If your vector creates a face (the inside turns blue when you hover over it) then you can extrude it even if it is not constrained.