First, Sign in to Blogger » Layout » Edit html and use Ctrl+F to find this blue line code which is located at the top part.
<title><data:blog.pageTitle/></title>
Replace it with:
<b:if cond='data:blog.pageType == "item"'>
<title><data:blog.pageName/> | <data:blog.title/></title> <b:else/> <title><data:blog.pageTitle/></title> </b:if> Save Change and get done.
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