Currently, custom PowerApps forms on SharePoint are not very responsive when a user zooms over 100 percent. It introduces a horizontal scroll bar once you zoom which means users that users with visual problems have to scroll in 2 directions. The behaviour is different when you open a SharePoint item without PowerApps, it seem to keep all the controls within the viewport without the need of introducing horizontal scrollbars.
From the accessibility point of view, custom apps in its current state is not very is not compliant for users with visual problem that have to zoom to see things clearly.
Please can you introduce a feature to make custom apps more responsive in line with the way vanilla list item open.