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To use a different resolution for part of a Landscape actor, use the Landscape tool Manage Mode (Unreal Engine Documentation) to move components into a different level, then change the Enlighten Quality of the Landscape Streaming Proxy actor.

Lightmap resolution

The For actors with Contribute Lightmap lighting mode, the size of a lightmap pixel size determines the resolution of indirect lighting resolution for actors with Contribute Lightmap lighting mode.

If you specify a smaller lightmap pixel size for an actor, Enlighten produces more lightmap pixels for each chart. Each Enlighten Quality preset also determines the lightmap pixel size.

Probe resolution

The probe resolution determines the indirect lighting for For actors with Probe or Contribute Probe lighting mode, the minimum spacing between probes determines the resolution of indirect lighting.

To set the maximum resolution of the probe grid for the entire world, change the Adaptive Probe Grid Spacing in the world properties.

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When World Partition is enabled, the world is divided into a grid and you can specify the lighting resolution for each grid cell. The Enlighten Quality or Probe Resolution value of each cell is applied to actors within the cell which have Enlighten Quality or Adaptive Probe Resolution set to Use Default.

To change the size of the grid cells, use Enlighten Resolution Cell Size in the world properties. All existing cell resolution values are cleared when the cell size is modified.

With an actor selected, use the Set Cell Quality or Set Cell Probe Resolution menus to assign a lighting resolution for the cell that contains the selected actor.

The Computed Quality and Computed Probe Resolution properties show the source of the lighting resolution value:

• World: The resolution was not specified for the actor, or its containing cell.
• Cell: The resolution was not specified for the actor, but was specified for its containing cell.
• Actor: The resolution was specified for the actor.

You can view and edit this grid the lighting resolution in the World Partition window. Switch to the Enlighten Cell Quality or Enlighten Probe Resolution mode and zoom in until the "Zoom In warning " text is no longer shown at the bottom left. Cells which have been assigned a lighting resolution value are visible.

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Drag a box, right-click and choose Set Quality From Selection or Set Probe Resolution From Selection to assign a lighting resolution for all cells covered intersected by the selection. To clear the resolution value of the cells, choose Use Default.