I can see that the
display is set to
none. So now we just need to track down what's causing that. Next to the Computed tab, you'll see a Styles tab. That will show you all the selectors and rules which match the element, and which file those selectors and rules came from.
You should search in them for something that says:
Once you find it, you'll see for that block there's some text that will point to a file. It might look something like
stylesheet.css. Right clicking on that, and opening in a new tab should give you the full URL, which will tell you the source of that rule.