When interacting with SAP GUI through Python using win32com.client, the SAP Logon window might become visible even if launched in the background using a VBScript. To prevent this, consider the following:

Minimize the window during connection:

After getting the application object, but before opening the connection, you can try to minimize the SAP GUI window. This might not entirely prevent it from briefly appearing, but it can quickly move it out of the way.

Use Shell.AppActivate with caution:

While Shell.AppActivate can be used to activate specific windows, using it to try and deactivate or hide the SAP Logon window immediately after connection might be a workaround, but it's not a guaranteed solution and can be unreliable.

Explore SAP GUI Scripting API documentation:

The SAP GUI Scripting API might offer specific methods or properties to control window visibility or focus. Consult the official SAP documentation for more advanced options related to background operations and window handling.

Consider alternative connection methods:

If the visibility issue persists, explore if there are other ways to connect to SAP through Python that offer better control over window behavior, such as using PyRFC for direct RFC calls if applicable to your task.