Microsoft 365 eDiscovery features will respect documented limits from May 10. The changes are likely made to conserve resources consumed by searches against the massive amounts of data now found in Office 365 tenants. The changes probably won’t affect eDiscovery investigators except in reminding everyone that the items shown in search preview are only a representative sample of what can be found by a full search.
https://office365itpros.com/2021/05/08/microsoft-tightens-control-over-ediscovery-limits/
