Such an option is not yet implemented in PrePoMax. So your feature request is relevant and I showed how it’s handled by other software for reference (so that it could be implemented in a similar way in PrePoMax in the future).
Currently, you have to change this setting for all constraints individually or recreate them with the Search Contact Pairs tool using a different setting for adjustment. Of course, you could also export the CalculiX’s .inp file, open it in any text editor, use the Replace feature to change this setting for all constraints at once and then submit the analysis outside of PrePoMax: Using standalone CalculiX