I'm trying to use QGIS 3.4.14 to clip a subsection of a larger map. What I tried doing was creating a new polygon shapefile layer, then using "Add Polygon Feature" to enclose the Falkland Islands/Islas Malvinas. I then went to Vector -> Geoprocessing Tools -> Clip and selected the layer with the polygon enclosure as the overlay layer and the layer named "Límites"(a line layer) as the input layer. It works...sort of. The layer containing the clip includes the outline of the coast of the Falklands/Malvinas, but I also get several other groups of lines farther out from the coastline. I don't want these. "Límites" is organized as some sort of hierarchy or grouping. What I want is just "Línea de costa", but the clip operation is also picking up "Límite del Mar Territorial Argentino" and "Línea de base".
I have tried hiding the unwanted elements and even deleting them prior to the clip, but they always show up. How do I get QGIS to only clip the "Línea de costa" object? This is what I get after the clip:
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