We would get this below error if our search returns more than 10000 records for Quick Find Query.
“There are more search results than can be displayed. Try adding more search terms (such as last name) to narrow your search results. If you contact support, please provide the technical details”
We can fix it by setting Enable Quick Find record limits to No in System Settings à General tab.
More details here
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QuickFindQueryRecordLimit exceeded. Cannot perform this operation error in Dynamics 365 CE – Nishant Rana’s Weblog
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