Hello Vicky, the past publishing requests in the Publishing queue are indeed replaced by newer requests and that previous history is not available. What kind of publishing issues are you trying to fix?

Are you working with a partner or IT for your Tridion Sites setup? Your or your developers could also ask on https://tridion.stackexchange.com/questions for technical questions related to publishing and the queue.

Edit: there's also a Tridion Sites idea or enhancement request for this kind of functionality. See: https://community.rws.com/ideas/tridion-ideas/i/tridion-sites-ideas/retrieve-the-complete-publishing-history and consider joining the ideas page to comment, vote, or submit product ideas for RWS to consider in future versions of the product.

Hi Alvin,

Thanks for your reply, Below one is exactly same as mine.

 Retrieve the complete publishing history 

Hi Alvin,

Thanks for your reply, Below one is exactly same as mine.

 Retrieve the complete publishing history