most of the text in this answer has been taken from another post
There's a proposal on main Meta regarding accepted answers floating to the top in the list of answers. I'll selectively quote parts of CM Nicolas Chabanovsky's question here to get you up to speed with the specifics of the discussion:
Today we changed the way we sort answers on Stack Overflow. We no longer pin the accepted answer (with the green checkmark) to the top of the list of answers. By default, we now sort strictly by votes (descending order by highest score), and the accepted answer's order in the list is based on its score.
We can change the way the engine sorts answers in site settings. We would like to hear from you all if it is something you want to see on your site. (Please let me acknowledge in advance that we will not be able to run a test on each site.)
Please let us know what you think will work best for your site! If you can discuss this question with your community it would be awesome. We are going to collect feedback before the end of September 19th.
How does the Politics meta community feel about accepted answers floating to the top? Should we follow Stack Overflow's lead of sorting by answer score only?
Feel free to use the answer box here to share specific concerns about answer sorting on Politics meta. If you want to discuss specifics about the new way of answer sorting then it's probably best to reply to Nicolas' question on main Meta.
Note: it is possible for a meta site to have different rules on unpinning then a main site, cause Ask Ubuntu has that.