I am wondering what triggers the two different grids. It seems to be random to me and no matter what I try to build/place/move I can’t change the grids. I placed a fireplace with the grid that lets you place 2 in one square, but now I can’t place my sofa straight infront of it because I get the normal square grid.
If you have not changed the bind for “precision placement” it’s “left shift” to switch between normal and precision grid.
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Thank you so much. This has really been bothering me and driven me crazy enough to rebuild several houses 
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You can find most keys in the “Keybindings” panel in the settings menu 