How to edit arc keeping center and radius?

[Piotr]

@RaptorUK

Maybe you could use FreeCAD ?

I use FreeCAD for designing 3D models.
When I had to define a PCB shape having small arcs rounding connections between other arcs I used LibreCAD. I showed it here:

Set the coordinate origin of Drill/Plate

When I prepared in LibreCad the dxf of my round PCB I have added there a small cross at circle center. Then importing I placed that cross at 0,0 absolute coordinates and finally deleted it. I don’t remember if I was able to position it that way at once or I had to use Move Exactly (I was doing it few years ago). That helped me also to position footprints that were in symmetry regarding the center point (connectors at right and left, round antenna and its connector have coordinates X=0): [R5…

LibreCAD seems for me for 2D much simpler than FreeCAD.
But if something is possible to be done with KiCad I just prefer do done it here. I asked because I supposed that it is possible and now I know that it really is. I simply fixed myself on one setting and didn’t got that the other one (just next to this one) is the one I should change.
I just spend some time making notes about what I found recently with hope that I will not ask the same next month
What I noticed are:
P - hotkey to group and move footprints selected by selection at schematic,
Shift+Space hotkey with information to remember that this flag can help or hinder.

Unfortunately after doing really nothing with PCB (just made this one arc) I have to abandon KiCad for probably a week or more. Since few days my brother insist on doing something else and I can’t put it off anymore.