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Hi @Salman Saeed
Thank you for reaching out to our Q&A forum.
May I know you are using Classic Outlook or New Outlook?
For Classic Outlook, you can create a search folder with the criteria set to "unread". This folder will return all the unread emails in that PST file.
Here I have a PST file, I will right click on Search Folder, choose New Seach Folder.
Scroll to the bottom and choose Create a custom Search Folder > Choose > Criteria > Set the criteria like below (Only items that are Unread) > Then click Save.
Now it will show a folder that only return unread items.
However, New Outlook is web-based (OWA-backed) and does not Search Folder in PST file. You still can add a search folder for primary mailbox, just not in your PST.
I hope this information helps.
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