tool compensation

Hi, I have question regarding tool wear and tool compensation. I noticed that when I am using one of my tool I a bit off with dimention accuracy. (When I changed tool cut is correct within digital caliper measurement). I think This operation is called tool compensation. I fund in documentation below page linuxcnc.org/docs/2.8/html/gcode/tool-compensation.html . But I am confused how to use it. I am using linux cnc  2.82 and I do not have  touch off and tool table option but I think replaced with dedicated button tool touch off button.  My question  is if I want to mill circle 20mm diameter and After messurment I getting 19.8 In both direction (X and Y ) how I should use it in order to get correct hole ? I know that I can change tool size in fusion by 0.1 and generate new toolpath but is there any way how I can get this directly in linux. I tried using this tool touch off but this seems to move coordinates for this specific tool but I was not on x0 y0 and I get some wrong offset etc. Can  someone explan how i can use it ?

thanks in advance.