freecad doesnt let you preview anything. you have to know the exact value ahead of time and put them in the left panel instead of a pop up box its also butt ugly. no smooth animation when switching angles. you have to dig through its terrible ux/ui just to change the grid values.
its not a decent alternative specially considering fusion 360 is free.
if you insist on using linyx exclusively then use ondhape atleast.
the only viable way to use freecad is by cutting primitives with the modifier.
dont get me wrong all cad software has clunky gimp tier ux ui but freecad is just the worst.
why cant i scale a segment or a shape in fusion 360 for example. why cant i fillet after using patch? why is the measuribg tool such shit when its so important.