What feature did we use to quickly apply the formatting shown in this image?

Answer:
Conditional formatting.
Explanation:
Conditional Formatting is the method that main objective to enabling the users for setting the formatting to the cell or the cell range as well as it adjust the layout based that are based on the cell value or the formula value.
The feature that was applied to the formatting shown in this image is the conditional formatting.
It should be noted that conditional formatting simply refers to the method that enables the users to set the formatting to the cell that the user wants.
The conditional formatting makes the cell value bold and highlights them just as depicted in the question. Therefore, the correct option is conditional formatting.
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