How do you configure the post menu setting so the accept answer is first ? What is the keyword ?
Discourse solved always ensures “accept answer” it the first icon in the post menu IF you are the OP.
If you are staff it is hidden behind the ...
This is not configurable and there are no plans to make it so
This has now been updated so the Solved option is outside of the … menu for all who can mark solutions. 
https://meta.discourse.org/t/discourse-solved/30155#marking-the-solutions-2