Partion Grid Cell Size


I’m setting up a new UMAP file with a world partition and can’t seem to find any information on how big a cell is.

The New Word Building Video had me believing that the grid size is 64m which is not the case.

A quick test has the cell size around 500m but it is hard to get this exact.

Am I missing somewhere that the cell size can be changed?

If this is a fixed size how do I get a visual representation in the viewport using the Provided Spatial Hash?