You can make grids visible in an activated model view even if the grids are not actually enclosed in the respective model view.
In the Axes, parallel dialog, you can now find a new checkbox option, in the Drawing tab, to "Project grid vertically for model views and drawings".
Grids that have this option checked are visible in activated model views which include the grids and in model views that do not include the respective grids but are positioned above or below the model grids. When you create a new grid, this option is checked by default.
See also: Grid and Axis Properties