Problem with textures

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To change the UV tiling in the material, you

  1. create a ‘TextureCoordinate’ node and plug it into the ‘UVs’ pin of the ‘TextureSample’ node
  2. click on the ‘TextureCoordinate’ node and change the ‘UTiling’ and ‘VTiling’ properties

See also Coordinates Expressions | Unreal Engine Documentation

To change the UV scale in the BSP surface, you

  1. select a surface with Ctrl + Shift + Left Click on it
  2. change the properties under ‘Details’ -> ‘Surface Properties’ -> ‘Scale’

See also Geometry Brush Actors | Unreal Engine Documentation