To use the Intel Compilers with Microsoft Visual Studio 2019 you must customize the install and enable additional workloads.
For Intel C++ and Fortran Compilers for Windows, it is necessary to install the Desktop development with C++ component from Visual Studio. This component is not installed by default. The Intel® Parallel Studio XE installation will detect the missing component and provide a warning, but the installation can still proceed. The component may be installed when Microsoft Visual Studio 2019* is first installed, or may be installed later.
More info:
Installing Microsoft Visual Studio 2019 for Use with Intel Compilers
https://software.intel.com/en-us/articles/installing-microsoft-visual-studio-2019-for-use-with-intel-compilers
Get Started with the Intel Fortran Compiler for Windows
https://software.intel.com/en-us/get-started-with-fortran-compiler-windows