We can modify table row/column size of table in presentation using simple dragging. But some tips we should know on using this function.
1.Change the size of the table using dragging:
We can put the cursor on the base points of the table, which is a small blue rectangle if you select the table(

), and the cursor will change to a small arrow(

), then drag it, the table size will changed.
2.Change the row/column size of the table using dragging:
If you put the cursor on the row/column border, the cursor will changed to a small arrow with two small vertical lines on it(

), then you can drag to change the row/column size.
But if you drag the first row/column, then other rows/columns after it will keep the original size and the whole table size will changed, but if you drag other rows/columns beside the first one, only the row/column size near it will be changed, and the whole table size will not changed.