I am not part of or related to unipark.
I dont think that back to “survey compiled” (draft) is possible. once its active you can switch back an forth between “active” (people can participate) and “no further participations” by clicking on the status element in “project information”.
But why would you like to reset the status? if you set it to “no further participations”, nobody can enter the questionnaire and via “test and validation > reset survey” you can recreate the internal database structure (that good if you have removed questions and some variables dont exist anymore) and/or you can delete the questionnaire data.