I have a workaround using bookmarklets for people who don’t want to install an extension. To use, drag the link below to your bookmark bar, then navigate to an Asana page and click it. It will change the styling in your currently open page.
Visit this page to try it out: Asana bookmarklets | asana-bookmarklets
Code:
Toggle sidebar expansion to 480px:
javascript:(function(){ var desiredWidth = '480px'; if (document.querySelector('.AsanaMain-sidebar').style.width != desiredWidth){document.querySelector('.AsanaMain-sidebar').style.width=desiredWidth}else{document.querySelector('.AsanaMain-sidebar').style.width='240px'}})();
Kudos to ShunS for the Bookmarklet idea.