Spreadsheet should be scrolled to right or down unlimitedly without setting maxrows and maxcolumns. By now, it only shows 20 rows and 10 columns as default maxrows and maxcolumns, to scroll the spreadsheet is not capable. Whereas if maxrows or maxcolumns being set, for example, maxcolumns="200", after user insert one column,they still only can see 200 columns instead of 201. The originally visible last column become invisible.