Dario, QGIS 3.20 has now a merged renderer that you may want to check.

A segunda, 23/08/2021, 15:40, Charles Dixon-Paver <[email protected]>
escreveu:

> You could use a geometry generator symbol style. Not sure of the best
> expression for it but even something like
> if("fid"=1,buffer(collect($geometry),0),0) should work
>
> On Mon, 23 Aug 2021, 16:25 Dario C, <[email protected]> wrote:
>
>> Hi,
>> I have road layer with several pieces of geometry.
>> is there any way to display like a unique polygon? I mean like a merged
>> geometry?
>>
>> I'm able to do it only making a duplicate and assigning "Inverted
>> polygons" with "merge polygons before render" option.
>>
>> Thank you.
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