How do I change the size of one unit without changing the entire opening size?
There are 2 sizing options available when changing the dimensions of one unit in a multi-wide configuration – Grow as Needed and Keep size.
Keep size will keep the overall opening size what it currently is when you change one of the units. If you have 3 units that are all 30” wide, and you change the middle to 50” wide, the other two units will shrink to 20” to maintain the overall opening of 90”.
Grow as needed will change the overall opening size to accommodate the new dimension you are entering. If you have 3 units that are all 30” wide, and you change the middle unit to 42” wide, the overall size will grow from 90” to 102”.