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This mode specifies the position of the instances based on a pattern.

Position - Use UVW mapping to scatter the instances in regular patterns.

UV Channel – Specifies which of the UV channels of the distribution objects to consider.

Pattern – Choose from the drop-down list which pattern to use for patterned scattering:

Grid – Rectangular grid.
Running grid – Rectangular grid with every other row offset by half of the grid spacing.
Hex grid – Arranges instances into hexagons.

Count – Defines an exact number of instances to scatter - either overall, or per area in the case of scattering defined by density (Per square option). The number is always limited by the Max. limit option.

Per square – When enabled, the number of instances to scatter is defined by density (Count per square having the given edge length). The number of instances is always limited by the Max. limit option. The specified value is the edge length of a square defining an area for computing the scatter density. The length is measured in world units

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Override by planar mapping – When enabled, simple planar UVW mapping is applied to the distribution object and used instead of its existing UVW channel.

Lock V – Locks the V coordinate for Spacing, Jitter, and Offset to the same value as the U coordinate.

Spacing [%] – Scales the pattern in UV space - 100% spacing makes the pattern occupy the whole 0-1 UV space; with 50% spacing the pattern gets repeated 2 times in both U and V, etc.
Jitter [%] – Randomly jitters each instance in the the U or V axis, with 0% being entirely deterministic placement (no jitter) and 100% being entirely random placement.
Offset [%] – Offsets the pattern in the UV space. Each 100% added or subtracted moves the pattern by one entire repetition - which means that e

.g. 0% and 100% offsets yield the same result.

Image Added

Edge Trimming – In render, trims elements of instances outside of distribute-on objects boundaries. This affects both base objects and include/exclude splines.

Slope Limitation – Enables instances limitation in the given slope range.

Angle – Defines the range of angles, measured in degrees, between either the "Local" or the "World" up vector and the surface normal, to which scattering is limited. Instances scattered outside of this range get filtered out.

Local / World – Specifies which coordinate space to use when computing the slope limitation. Coordinate space of each individual distribute-on object is used when "Local" is selected, and world coordinate space is used for all distribute-on objects when "World" is selected.

Altitude Limitation – Enables instances limitation in the given altitude range.

Range – Defines the range of altitude units either in the "World" or "Position Independent" mode.

World / Position Independent – Specifies which mode to use when computing the altitude limitation. In "World" mode the altitude of the surface points on each individual distribute-on object is evaluated in world space (after all transforms). In "Position independent" mode the altitude of the surface points on each individual distribute-on object is evaluated relative to the object center, while the object rotation and scale still affect the altitude.

Falloff Curve – Opens a falloff curve editor. This allows specifying the density of the scattered objects depending on their altitude. Lowering the point on the left side of the curve results in lowering the density of the objects closer to the minimum altitude range. Lowering the point on the right side of the curve results in lowering the density of the objects close to the maximum altitude range.

Edit Instances – Switches to Instances sub-object mode, allowing you to override individual instances in the viewport. You can move, rotate, scale, or delete them. It is not effective in a greater scale, but may serve well for final touches in small amounts of instances.

Brush – Toggles on and off the paint mode. In this mode, instances are painted by the user in the radius of the painted positions. 

Erase – Toggles on and off the erase mode. In this mode all the instances in the radius of painted positions are erased (by editing).

Brush Radius – Defines the radius of painted brush.
Painting Rate – A number of instances that should be tried to paint upon a brush actions in the brush area. The value ranges in [1,200].
Follow Scatter Rules – When this option is not checked, you can brush outside of specified areas or ignore rules like Avoid Collision, Slope Limitation, Altitude Limitation, Edge Trimming, or Camera Clipping.
Erased Only Placed Instances – When enabled, erase the instances that were painted with the brush.

Convert to Max geometry – Replicates this scatter using 3ds Max instances. This is usable only for a small number of objects.