Use the "Ctrl End" key combination to quickly move to the last cell, or use the "Ctrl ↓" or "Ctrl →" key combination to move to the last row and column.
Click the "Home" tab
Click the "Delete" button in the "Cells" group to open Delete drop-down menu
Click the "Delete worksheet row" command in the drop-down menu to delete the last row
Click the "Delete Worksheet Column" command in the drop-down menu to delete the last column
Done!
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