Game Settings: XP Options - Genii-Locorum/brp GitHub Wiki
Auto tick XP check - this determines what circumstances will lead to a skill etc having an XP check added automatically. The options are "None" in which case it will never happen, "Any Success Level" which means the tick will be added as long as you don't Fail or Fumble, or "On Fail or Fumble" in which case it will happen if you don't succeed. This will only happen when the Difficulty is not easy. This doesn't prevent it being checked or unchecked manually.
XP Improvement Dice - enter the dice to be rolled when a successful improvement check is made and you choose to have a rolled increase. The default is 1D6.
XP Fixed Increase - enter the value for when a successful improvement check is made and you choose the fixed increase. The default is 3.
Show Improvement Dice Rolls - if you have Dice So Nice module and you tick this option then you will see the dice being rolled for XP improvements. This is turned off by default due to the number of dice that could be rolled.