Terrain brush size?

I’m just learning to use this program. I’m trying to set up some terrain brushes.

When I paint with the terrain brush, it automatically paints out a 3x3 section. Is there any way to reduce that size so it only paints a single tile? (but still alters those around it in the 3x3 section.)
With this current size I can’t paint in small areas. I could logically have a group of 2x2 tiles painted to match the terrain, just being two corners placed next to each other. But I can’t paint them with this brush if it automatically fills three tiles.

Hold down Ctrl, that will paint corners rather than whole tiles, effectively making a 2x2 group.

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