Quick Tip: Alle Elemente in einer Liste per Powershell löschen

Connect-PnPOnline "https://tenant.sharepoint.com/sites/meineseite" -Interactive

$listname="meinlistenname"

Get-PnPListItem -List $listname -PageSize 500 |foreach-object {Remove-PnPListItem -List $listname -Identity $_.Id -Force}