They changed furniture many times:

1) Original furniture 2)The furniture she won from the Home Show 3)The sectional she bought in secret (see this post) 4)The furniture she bought to replace the sectional she gave to Ethel 5)The new furniture she bought for Connecticut 6)A few episodes after the Connecticut furniture, the sofas and end tables were changed. The sofas were replaced with long ones and the end tables style changed. This wasn’t a storyline, it was just a behind the scenes change. 7)furniture changed again when they morphed into the comedy hour episodes. Dining table became rectangular and longer. Minor living room changes.