With the exception of the Win column, the yellow pop-up instructions on the Bets worksheet only appear for the first 20 rows.
If you find a pop-up does get in the way, try scrolling down so that the input cell is further up your screen. This will enable the pop-up to be displayed below the cell rather than next to it.
If you want to disable pop-ups for the Win column, highlight the column and in the main menu select Data -> Validity. Go to the 'Input Help' tab and disable "Show input help when cell is protected".
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