This is called "Blogger/blogspot Title Swapping". Swapping blogs title can help boost your position in search engine results page listing and also increase clickthroughs. From an SEO (Search Engine Optimization) perspective, page title is the most important element in your blog in terms of ranking well in search engines. If you look at your browser's title bar you will notice that Blogger's default templates display your blog title in front of each page or post title. So page title would normally be displayed as:
After swapping the blog title, it will be appearing like this:
How to optimize blogger post titles
Step 1. Log in to your Blogger Dashboard and go to Template > Edit HTML
Step 2. Click anywhere inside the code area and press the CTRL + F keys to open the Blogger' search box
Step 3. Type or paste the code below inside the search box to find it:
Step 4. You need to replace the code above with this one:
<b:if cond='data:blog.pageType == "item"'>Step 5. Click Save Template and you are done!