How can i change the settings of an build-in effect which will be used in brushes or filters permanent? I change a value and override the effect with the new settings by the context menu. While LR is running this works fine. But restarting LR resets the settings to the default values.
The best course of action is to create the preset you want and give it a new distinct name. On the new preset the values will stick. You just have to remember to go to your preset instead of Lightroom's default preset.