Doesn't matter what version of TBDev you're using or even if it's a TBDev. You can alter theme container or whatever the class or id it's called. Just do an inspect element on your website and check what div has the current width of your website and then overwrite it.
For example:
HTML Code:
<div class="container"></div>
this div should give your website the actual width and in your css file you should have defined already the value for that width, let's say 1440px
HTML Code:
.container {
width: 1440px;
}
the you should go into your container class and change that value to any other value you want