How do I change the grid in the symbol editor?

I need a varistor symbol for a project. So I basically tried to re-create the resistor symbol and noticed that its corners are off the grid. However, the grid size input is grayed out. While the initial choice of grid is without doubt sensible, is there some switch to unlock the grid size in the symbol editor?

Hold down the “fine grid modifier key” which is usually alt. This reduces the grid by a factor of 10.

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