Open Folder (from the File menu), and open the folder containing your sln file (or the folder containing the csproj if you have only one csproj)YesF1 or Ctrl+Shift+P) and type > .Net : Generate Assets for build and runStatus bar with the Omnisharp logo (see second attached screenshot)

Open FolderFilecsprojcsprojYesF1Ctrl+Shift+P> .Net : Generate Assets for build and runStatus