The Add column option lets you add new columns to the sheet.

You can click on the +Column as shown below and a pane will open in which you can choose the type of the column and write the name of the column.

You can add multiple columns at once by simply clicking the +Add icon in the pane as shown below. Once you have defined each of the columns you want to add you can click Add Columns at the top left of the pane and the columns will be added at the end of the sheet.

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