Hi @Selvam, Raja Priya ,
Thank you for the reply, I now understand your problem.
Version history is available only for files, such as files in your library or page files in site contents.
Currently your question1, question2 and question 4 cannot be solved, it is by default.
About question3, you can restore a site collection from recycle bin first and then rename this site collection.
Site collection URLs are unique for both in the Recycle Bin and in the active site. So this operation will not affect other sites with the same name.
I hope I can offer you a better experience next time if I have a chance to work with you again.
Yours sincerely,
Renjie Sun
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