Question

the dash button align the data in the centre of the merged cells​

Answer 1

Explanation:

Sustainability is the capacity to endure in a relatively ongoing way across various domains of life. In the 21st century, it refers generally to the capacity for Earth's biosphere and human civilization to co-exis

Answer 2

The button for merge and center or simple merging command is on the Home tab. Select the cells to be merged and click on the button that looks like this. This will align the data of the upper most right cell or the upper most left cell at the center.