Thank you for your post.
The Hide Window command is not available in FileMaker Go. If you don't want the user to see a second file, then close it.
For more differences between FileMaker Pro and FileMaker Go, please see Knowledge Base Article #7734:
You can also use filemaker to set up privileges on the secondary files so that they cannot be modified and/or viewed by the user if they do open it.
Good answers - thank You