Found these at YC:
March 21-26 has garden view rooms.
March 28- April 3 shows standard & water view rooms.
Disney is using an algorithm to book rooms now. Sometimes it’s just the dates you’re checking. Or which date you’re trying to check or how long you’re staying. There might be a room available for 5 nights, but if you are looking for 4 nights, it won’t show up. March is Spring break for a lot of places & Flower & Garden festival happens then, so Epcot resorts are often full. There may also be conventions booked at YC. So it isn’t unusual for those resorts to be pretty fully booked less than 6 months out.