I see. I got confused by the fact that newly selected grid doesn't appear right away and requires screen redraw in order to appear (e.g. zooming in or out).
So here is what needs to be done in order to make only the current grid visible (all settings are in menu Setup > Grids): 1. Uncheck "Displayable" checkbox for every grid 2. Check "Grids Displayed" checkbox 3. Check "Display Current Interactive Grid Only" checkbox
It would be great if in the next version screen would get redrawn automatically after a new grid is selected.
The grid steps set and the grids displayed are effectively two different settings. You can have a different grid set for working in the design whilst displaying different grids. There is the setting as Ty stated which will set the grid for working with an item type as the grid step and turn others off, but this is 'momentarily' whist in the function. So just because the grid step is changed to a certain grid, the screen will not be redrawn to that grid, it will display what has been requested by the Grid settings dialog. Zooming or repainting the screen does not reset which grids are displayed.