Filter Repeteable group fields using views - Filtering a Repeating Field Group by it's (own custom) fields, that will allow you to search within the Repeating Field Group entries
There is a workaround to achieve this if you just wanted to search within the entries added using the Repeating Field Group. Where you can set your view to display Repeating Field Group and add the query filters using "Query Filter" section and then add the front-end filters to "Search and Pagination" section and add the RFG fields you want to display within your view's "Loop Output" section.
You can find the proposed solution, in this case with the following reply:
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