Policies are the rules every rack and station decides by. Each change is a new version: it shows its impact on open work first, and going back is one more version through the same review.
Presets
Strict or Relaxed sets every preset value at once, in one version. A value set for the site, a rack, an item or a station overrides the preset where it applies: the first matching rule wins, from the most specific scope to the site.
What never relaxes
Approvals are off until switched on per action and scope. Fixed safeguards never relax. Publishing needs the policy grant; switching the preset needs it site-wide.