Rectangular app icon and preview on Tizen 2019

On Tizen 2019 the icons on the App Bar (SmartHub) are rectangular, but when I install an app from Tizen Studio, the app icon is squared. How can I set a rectangular icon on locally installed apps?

Also, locally installed apps are not showing the preview content on SmartHub, but this works for the same app on other models, like Tizen 2020. How can I see preview content on 2019 models?