VS2019 Setup project. x86 and x64 are not copied to target machine

When I build my VS2019 C# application (which uses SQLite databases), I find these x86 and x64 folders containing SQLite.Interop.dll in the output folders. Like this:

\bin\Debug\x86\SQLite.Interop.dll
\bin\Debug\x64\SQLite.Interop.dll

I have created a VS2019 Setup project based on Windows Installer.
After the installation on the target machine the application crashes. To prevent crashing I had to manually copy x86 and x64 folders into Program Files target forlder.

How can I tell the setup project to copy those folders to target machine?

Thanks for your help