There should be an option to set all system options' value to their default, same values which are set when session starts the way it does in goptions reset = all.
Suggestion: place the following code in your autoexec.sas to backup your (default) options as soon as SAS starts:
proc optsave out=work.options_backup;
You can then restore your options (or specific selections) thus:
proc optload data=work.options_backup;
Hope this helps.
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