Close All Grids 
Use Close All Grids to close the open ("buffered") grid. The grid will still be displayed in the window, unless you have chosen to display grids using the Dynamic Display Grid option (under the Grid Calc > Display submenu) in which case the grid will be removed from the display.
If necessary, use the Clear All Grid Calc Underlays option to remove grids from the screen. This option can be an important part of a macro by avoiding over-utilisation of memory resources because too many grids are displayed at the one time.
Instructions
On the Grid Calc menu, point to Grids, and then click Close All Grids.
The loaded grid is removed from the buffer and closed.