Welcome dialog not displaying when msi file is used to install

[LindaB887]

Running WiX 3.10 from Visual Studio 2019

I cannot find the actual Welcome dialog that displays when I install using the exe file, but I need it to display when I install using the msi file as it has the Options button to allow for the install location / directory to be changed.

The WelcomeDlg in WixUI_FeatureTree is different and is redundant when the exe file is used to install so I made it not display. I might be able to add the Options button to this dialog and use it for both the exe and msi file installs, but I have no idea how to turn off the running Welcome dialog that the exe displays.

Questions:

• where is the code for the "Welcome / Install" dialog?
• can I control when it is displayed?
• is there a property / variable that I can use to see which file extension - exe or msi - was run to install?

Any suggestions will be greatly appreciated.