[Therion] Elevation grid

Hello Is there a way to make Therion not add one cell of grid at the top and bottom of the extended elevation map? After adding grid with export map -proj extended -layout-grid-size 250 250 250 m I have the following problems 1) large empty space at top and bottom of map 2) problems with old scale of map (Map is too large for PDF format. Try smaller scale!) -- WBR, Vasily