i'm also interested to know how to add splash screen to my dashboard application on arcgis enterprise 10.9.1.
Splash screen is not an out of the box widget until Enterprise 11.3
https://doc.arcgis.com/en/dashboards/latest/get-started/add-a-splash-screen.htm#:~:text=A%20splash%20screen%20shows%20information,making%20dashboard%20navigation%20more%20effective.
You could embed your dashboards into EXB and use the splash screen widget there.
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