While what @Clasicwebtools says is true, this won’t necessarily work if the thing you’re searching for is a reusable element. (Happened to me the other day as I was inspecting some of my own work and I was like, “WTF is this empty element and why does it not show me the things inside it!???!???!!!???”)
In particular, if the reusable has been assigned a new name, it will be doubly difficult to understand what’s going on. So, in your case (where, surely the template designer is using a reusable and then changed its name), you do the following…
This is a real world example of my “mystery element” and how you find where its definition is hiding:
Double-click the element:
Then click the (i) icon (badly circled in yellow, above) to reveal the inspector panel:
Note that the inspector panel is telling us “This element is a reusable element, click here to…” Clicking that link will take you to the editor page for the reusable in question.
THAT is where your weirdness is happening.