g2 g3 not working

G2 and G3 will do nothing on it's own as you have them in MDI, they need other values
linuxcnc.org/docs/html/gcode/g-code.html#gcode:g2-g3

With which version of LinuxCNC?

This may be a simple case of miscommunication by the original poster so the way to deal with this would have been to ask for more information.
Irony and humor are difficult things on a forum and while often well intended they create more confusion than anything else.

What did i miss ?
On the screenshot, the MDI list has ONLY G2 and G3 without the required R i j k values, as noted on the bottom right, so that will do nothing as such.