Select the whole part, it should turn blue. Then right click on the part (on an open area, NOT on one of the dots). Then select “fix/unfix”. After that you should be able to move/scale as usual. I’m very new to this, but it seems to only do that to me when I save the image as SVG in Inkscape, then open in Fusion. If I save as a DXF, I don’t have that issue