Quick start: add any mesh object (it is ignored), add a Geometry Nodes modifier and pick Tidebone Windows & Doors Lite. Set Width, Height and Sill Height, then Sashes, Bars Across, Bars Down, Transom and Sill. Raise Columns (up to 4) and Rows (up to 3) for a simple facade.

The element looks to −Y; the origin is the floor-level centre of the grid. Seed changes the room tone behind each window.

The README with all inputs is included in the download.