Hi @somawheels !
I see from the image you uploaded that you are using Rider. As far as I know, there are 3 ways of indexing (that’s what it’s called, for the IntelliSense to work) the files that you are describing.
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One is to invalidate the cache, this will force indexing of the solution.
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Indexing manually the files that are missing, pressing the Eye icon on the top left of the Explorer (image below), then you’ll be able to see the files that are not indexed (they’ll appear in yellow), right-click a file and press “Include”
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Regenerating project files: Right-click on the uproject file and select “Generate Visual Studio project files”
Hope this helps, Kind regards
Raimundo