When preferential screens are created and later modified, it is possible to accidentally have buttons that expand beyond the screen boundaries. This wasn't much of an issue with the Legacy POS User Interface, but this can lead to random crashes or even the POS not starting at all with the Advanced POS UI.
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Select an existing preferential screen and click the Modify button to edit its properties.

On some occasions, it is possible to have buttons where the Right Expand or Bottom Expand options are enabled but grayed out because the button is on the edge of the screen.

This happens when copying or moving an already “expanded” button to the right or bottom edges of the screen. It can also happen if the screen's properties were changed. Here are a few tricks that can help in identifying problematic buttons:
If the screen has fewer than 50 buttons, increase the screen size to quickly spot expanded buttons and fix them before reverting to the original screen size.
Here is an example with “Screen 18” where everything looks normal:

Increasing the number of buttons by switching to “Screen 36” shows that some expanded buttons were actually hiding on the edge of the screen:

50 is the maximum number of buttons that can fit on one screen. To quickly spot problematic buttons in this case:



The same issue can occur on Screen Layouts. However, there are no fancy tricks to detect out-of-bounds buttons.
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Select an existing screen layout and click the Modify button to edit its properties.

Unfortunately, there are no fancy tricks to detect problematic buttons on Screen Layouts. You need to double-click on each button that is located near an edge and look for grayed-out expand options:

Next, you will need to move the button (drag & drop) to an empty space that will allow it to expand properly. Then, you will be able to disable the Expand options and move the button back to where it was.