If your worksheet has data in a table format and you no longer want the data and it’s formatting, here’s how you can remove the entire table. Select all the cells in the table, click Clear and pick Clear All.
Tip: You can also select the table and press Delete.
If you want to keep the data without the table format, you won’t be able to do it in Excel Online. Learn more about using the Excel desktop application to convert a table to a data range.