Movement is indeed working again.
Glad to hear that!
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TerrainSize = VoxelSize * 16 * (2 ** Depth)
By default Depth = 13 and VoxelSize = 100, so the default terrain size is 13107200 cm = 131 072 m.
If you need more you can increase Depth, but be careful as it can crash the editor. Also you will quickly run into float precision problem: SetWorldOriginLocation may help for this.