From iOS 26 the arrow edge passed to popoverTip is only a preference.
When the VM toolbar spans most of the screen width, the system attaches
the "Tap to hide/show toolbar" tip beside the chevron instead of below
it, covering the other toolbar buttons until the tip is dismissed. This
happened on iPhone on iOS 26.1 and on iPhone and iPad on iOS 27.
On iOS 26 and later, restrict the tip's arrow to the edge facing the
toolbar, using the top edge when the toolbar is docked at the top and
the bottom edge when it is docked at the bottom, so the tip always opens
toward the middle of the screen. iOS 17 through 25 keep the existing
behavior.
Assisted-by: Claude:claude-opus-5