You are using Grid Size for Unity 3D,I want Grid size for a diffrent program,but you cannot change grid size in Asset Forge.Do not use this unless you are using Unity 3D.Waste of money.
You can adjust the size of the grid by changing the value in the upper left corner, models created using Asset Forge are compatible with nearly all game engines including Unity, Unreal Engine, Godot, Roblox and more. Not sure if you're facing a technical issue? Let me know and I'll try to help!