Blender particles. Grid based emitter only allows maximum of 1000 particles. Any way to increase this? I have a particle emitter attached to a cube in my scene that is emitting ico-spheres from its volume.  I want it to Emit in the grid shape (as it currently is)

except for that I want it to contain a lot more than just 1000 particles.  when I select the grid emission however, the particle amount is automatically set to 1000, and the number value in the particle settings is grayed out
(see below).
No matter what number I set it too, the particles don't change at all.

does anyone know of any way to increase this number beyond 1000 while still keeping the grid formation?
Thanks!
The Resolution sets the density of the particles.
In your case you have a cube with a resolution of 10 - so 10x10x10 = 1000 particles.
For more particles simply increase the resolution.