If I pull document tab out from its main position, how do I get it to snap back to its original location?

[Boldline]

If I pull the document tab out from its main position, how do I get it to snap back to its original location? Here is a video showing what I am talking about. I was expecting the blue highlight guide to appear when I was hovering over the intended spot with the selected document tab. Is there a setting specific to allowing this to happen?

[VectorStyler]

@Boldline Drag the detached document from its title leaf (the "Untitled..." text in the image) and drag it over the area where the attached title leafs supposed to be. There is a thin gray line indicating the area.