Mini pageLayout popup not displaying for Extenal Object

Mini page layout is working fine in Salesforce Standard & Custom objects.
But, I need to create Mini PageLayout for Exernal Object, which acts when hOver to the link of the record in child record It’l popup a mini page with respective record

Answer

My understanding is mini page layout only work for external objects when you hover over ‘recent items’ and not lookup fields or child records. I would love to be proven wrong here.

So you might have to either consider this as system limitation now or go for something custom (which is not a feasible approach here).

Attribution
Source : Link , Question Author : Rock SFDC , Answer Author : Amit Bangad

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