Hello @wanizubair, this contribution can not be verified because this can not be considered as a bug. You are actually on the first page of the browser without previously opening any page. That button will only work when you have some previous page opened.
Please be sure you have full understanding on how an app should behave before assuming anything as a bug.
Bug report should not be based on assumption. You need to have full understanding of the project first.
Thank you.
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RE: Contribution : 'Back Button' is not working in CLOVER