Final answer:
To collapse an expanded array formula, you can use the 'Collapse' option provided by the software or platform you are using. Alternatively, in programming languages like Python, you can redefine the array formula without the range you want to collapse.
Step-by-step explanation:
To collapse an expanded array formula, you can use the 'Collapse' option provided by the software or platform you are using. For example, in Excel, you can collapse an expanded array formula by clicking on the minus sign that appears at the top-left corner of the array range. This will hide the expanded array and display only the formula cell. To expand the array again, you can click on the plus sign.
Alternatively, if you want to collapse an array formula in a programming language such as Python, you can redefine the array formula without the range of cells you want to collapse. This will effectively collapse the array and display only the result.