It's in ACP admin/settings/general
I want to delete this button，what files should I modify?
Moved Technical Support
@Hentai make sure you know what removing it does before you do, removing it makes it impossible to change between container and container-fluid, removing it won't force your site to one width or the other, so it may be inconsistent for your users.
However, hide it using CSS, if you remove it from the theme, it makes upgrading in the future a pain.
I'm on my iPad at the minute, but Use firebug or some other browser based development tool to get the class name. (I think it's panel resizer) and set the CSS to
If you really want to mess with the code, it's here
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