How To Remove Unwanted Formatting in Blogger

How to make new formatting render on blog post 

Simple reformat might not be enough to change the appearance of your Blogger blog post. Here, we'll share how to completely remove unwanted formatting so that your new formatting will apply.

1.  Enter compose mode via "edit". 
2. Place cursor inside compose area (post editor)
3. Press Ctrl + A on keyboard (select all)
4. Find and click the T with red x on edit menu at top of page (remove formatting)
5. Now format text as you wish 
6. "Update" post.

REF:

Blogger Forum Contributor Peter McC. Google Product Forums. Blogger Help Forum. 23 July 2013. <https://productforums.google.com/forum/#!topic/blogger/d9H91ElH42Y> 02 February 2016