Looking to access your theme's code or language options with Shopify's new theme editor layout?
In your Shopify admin click on Online store > Themes
Next to the theme that you want to edit click on the Menu button which is a small square with 3 blue dots
This will open a submenu of options which includes: Edit HTMl / CSS and Edit Language
To over-ride the size of this button and allow it to be seen in full it is a very simple and quick style change.
In your shopify admin click on themes > customize theme > theme options > edit HTML / CSS
on the next page open: Assets > stylesheet.css.liquid
scroll to the bottom of the page and paste in the following after all other code:
clear: left! important;
display: block! important;
width: 100%! important;
width: 144px! important;
height: initial! important;
Click save when done - this will allow that to show at full size.