Building: Guides
Grid
Grid Guide
The visual grid serves as a reference of alignment. It adapts to the current grid size you're on. You can customize the transparency and color of it in the General Options.
Don't want the visual grid? Setting the transparency of the grid to 0% will turn it invisible.

Grid Size
You can change between grid sizes using Num -, except for the Brick grid size, which is only available through Alt.
Plate
: Dimensions of a 1x1f plate
1/2
: Half of a 1x1 plate, height is still the same as a 1x1f plate
1/5
: 2x microbrick size, half of a 1x1f plate's height
1/10
: Half of a 2x microbrick, most granular possible grid size
Brick (Alt only)
: The grid automatically adjusts to the size of your current brick.
Invisible Brick Indicator
When you have a building tool equipped, the game will show all invisible bricks with a half-opaque effect.