The forecast for windows in the coming year and beyond is big units with an unobstructed viewing field, set in minimal frames of a dark hue. The aesthetic is unabashedly modern, and shapes are square and rectilinear. “I actually think the move towards modern—I use the term to mean clean and unfussy—is here to stay,” says Greenwich, Conn.-based designer and builder Sabine Schoenberg, host of Sabine’s New House. To achieve the large window units that homebuyers want, architects are mulling windows together, sometimes mixing shapes. Corner windows are a trend, says JELD-WEN’s Jennifer Matson. “For larger windows, like in living areas, fixed windows are just fine. We can make an inoperable window larger than one that operates. It just comes down to the weight of the glass.” “Everybody wants more glass and less frame,” says Joe LeFlore, South Florida Millwork vice president. “Bigger is better. I got five plans today…