What does clicking the decrease decimal button do?

Clicking the decrease decimal button in a spreadsheet reduces the number of decimal places displayed for the selected cells. Specifically, it effectively moves the decimal point one place to the left for each click, thereby reducing the precision of the numerical display. For example, if a number is shown as 12.34, clicking this button once would change the display to 12.3, and clicking it again would change it to 12. This function is useful for simplifying the presentation of numbers, especially in scenarios where excessive decimal precision is unnecessary.