I want to make Inno Setup create a single application shortcut/icon in Start menu, instead of placing a folder (aka program group) in Start menu with the icon in it. May I know how to achieve this?
I don't want the Start menu to have uninstall shortcut either. To uninstall, I expect the user either right click the exe from Start Menu and select "Uninstall", or go to program features to uninstall the app.
To create an icon in the top-level of the Start menu use the *programs constants:
[Icons]
Name: "{autoprograms}\My Program"; Filename: "{app}\MyProgram.exe"
Inno Setup does not create any icons in the Start menu on its own, not even the uninstall icon. If your installer is creating the uninstaller icon, you must have an explicit entry in the [Icons] section for that. Remove it.
Though Windows 10 won't show such icons anyway:
Inno Setup Start menu uninstall shortcut is not shown on Windows 10