As I know, From M Os, with tablet models that have width larger 600dp. Notification Panel will be displayed at where we touch on.
1. With the current attached screenshot, we touch on the center of status bar (or drag down notification panel at center position). So, Notification Panel is displaying at center
2. But if we touch on right of status bar, Notification Panel will be displayed at right
3. and also display at left, if we touch on left of status bar
Screeshot for case 1. be displayed at center of screen
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Screenshot for case 2. be displayed at right of screen (symbolic image)
Screenshot for case 3. be displayed at left of screen (symbolic image)
I searched code at Statusbar.java, NotificationPanel.java, but cannot find out code that google handle it.
Have anyone who know where google handle it at Android 9 Pie?