User strategies are uses by service profile for user profil to activate or deactivate some functionnality for users and MySites.

Here is 3 ways to proceed:

Central Admin

C#

using (SPSite site = new SPSite("https://myAdminUrl"))
{
     using (SPWeb web = site.OpenWeb())
     {
        SPServiceContext serviceContext = SPServiceContext.GetContext(site);
        UserProfileManager usrProfil = new UserProfileManager(serviceContext);
        PrivacyPolicyManager prvPolicyMgr = usrProfil.GetPrivacyPolicy();
        PrivacyPolicyItem[] pPolicyItems = prvPolicyMgr.GetAllItems();
 
        foreach (PrivacyPolicyItem policyItem in pPolicyItems)
        {
          if (policyItem.Group.Equals("appartenances", StringComparison.InvariantCultureIgnoreCase))
          {
              //Check if the Privacy policy is deactivated
             if (policyItem.PrivacyPolicy == PrivacyPolicy.Disabled)
               continue;
 
             policyItem.PrivacyPolicy = PrivacyPolicy.Disabled;
             policyItem.Commit();
          }
       }
    }
}

PowerShell

if((Get-PSSnapin "Microsoft.SharePoint.PowerShell") -eq $null)
{
   Add-PSSnapin Microsoft.SharePoint.PowerShell
}
 [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Office.Server")
 [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Office.Server.UserProfiles")
 [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")
 [System.Reflection.Assembly]::LoadWithPartialName("System")
 
$site = new-object Microsoft.SharePoint.SPSite("https://mySite")
$ServiceContext = [Microsoft.SharePoint.SPServiceContext]::GetContext($site)
$web = $site.OpenWeb()
 
$upm = [Microsoft.Office.Server.UserProfiles.UserProfileManager](Microsoft.Office.Server.ServerContext]::Default)
 
$prvPolicyMgr = $upm.GetPrivacyPolicy()
$pPolicyItems =  @($prvPolicyMgr.GetAllItems())
 
foreach($policyItem in $pPolicyItems)
{
  if($policyItem.Group.Equals("appartenances",[System.StringComparison]::InvariantCultureIgnoreCase -and $policyItem.Privacy -neq [Microsoft.Office.Server.UserProfiles.PrivacyPolicy]::Disabled)
  {
    $policyItem.PrivacyPolicy = [Microsoft.Office.Server.UserProfiles.PrivacyPolicy]::Disabled
    $policyItem.PrivacyPolicy.Commit()
  }
}
 
$web.Dispose()
$site.Dispose()

For this script, you »ll need to run powershell with sufficient privileges =>Run powershell with elevated privileges