I have read and found that PowerBIIntegration.Refresh() is available for new apps. However, when I start a new Power Apps from Power BI, the display is for cellphones. The rendering in Power BI, thereafter, is way too small. I can't create a new app with a tablet layout when launching from Power BI, only when I start a new Power Apps from the development portal. Then the integration Refresh() function isn't available because it doesn't have a hook into it from Power BI.
Is there a way to have an override force new Power Apps create anew from Power BI with a tablet layout?