I have a layer with like 20 polygons which I imported from Google Earth Pro.

And what I am trying to do is to exclude (isolate) that one big polygon which is in a way of all other smaller ones so they are not visible under big one.

I know that one way is to make it transparent, but while doing that all other polygons will become transparent aswell.

So what i need is like a tool or something which will help me to "extract" only one specific polygon from all those in a same layer, into another layer, and after that i can transform it into lines (Vectors) so there will only left boundarys of that specific polygon which can be seen on picture, or even make it transparent.

enter image description here

closed as unclear what you're asking by whyzar, nmtoken, Vince, Jochen Schwarze, ahmadhanb Oct 30 '18 at 8:26

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Possible duplicate of How can I transform a polygon to a linestring in QGIS? - answer is old but still valid – Erik Oct 29 '18 at 12:29
  • Yes Erik you are right but I am using QGIS3.2 and it is diffirent than 1.7 so can you describe me how to do it? And can you add new tag QGIS-3.4 Madeira :) – Roby5 Oct 29 '18 at 12:30
  • I would be rather surprised if the name of the tool changed substantially. – Erik Oct 29 '18 at 12:32
  • Yeah it is same but problem is that when i imported from GE there are a lot polygons on same layer so I have one which is really big and over whole map and I am not able to shut it down, so that is why i was thinking changing it to line, but not whole layer just that one specific one. – Roby5 Oct 29 '18 at 12:36
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    What lines? Do you want the boundary? Do you want all possible line segments between any two points on the boundary? What result do you want? – jpmc26 Oct 30 '18 at 3:02

If you write line in the search box of Processing toolbox in QGIS 3.4, you will have Polygons to lines:

enter image description here

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