These changes are mainly good for developers.
Layout editor sidebar toggle. You can toggle collapse it to give more space to work on code.
SASS also outputs minified version. It outputs both a full CSS version and minified one.
SASS output path simplified. Now you can specify an output directory for SASS compiling. This helps for Bootstrap themes where the .scss file is in a different directory than the CSS files.
Fix for default queries. There was an issue where it wasn't working for some users.
Here's a screenshot of the layout sidebar collapser. You click on the "arrow left" button.
Here's a screenshot of how you can set the directory for the compiled CSS file. You click the "three dots" button to the right of the "compile" button to specify. It will then remember the location and always save it there.