Thank you @amario for the guidance. One more issue I found. I tried to add 6 tics point on X axis. If I write the command in the lower dialogue box, then it is not getting activated in the plot. But it is working on the side text box (Please see the attached image). Earlier I think, it used to work if I write them in the lower box. For example, the command for ytics format is working although it is written in the lower box. Is it normal ??
note: This machine is UBUNTU 22.04 LTS with latest FLUKA and Flair softwares.