How to set round copper keepout zones?

[maui]

there is also an option in kicad StepUp to draw arbitrary contour fill zones / keepout zones:

How to define keep out zone

StepUp has the option to push keepout area and/or fill zone from FreeCAD to KiCad… you can pull your board in FC, design your keepout area aligned to what you need and then push it to your K board.