A dynamic array can't spill because something blocks its output range.
Fix this with AI#SPILL! appears when a dynamic array formula (like FILTER, SORT, UNIQUE) can't write all its results because cells in the spill range aren't empty.
Clear the blocking cells
Delete content in the cells the array needs to fill.
Move the formula
Place it where there's room for all results.
Dynamic arrays spill into adjacent cells; clear those cells or move the formula.