This plugin is made to be a set and forget layout manager. You just set your layout parameters and the layout will automatically change depending on what units are available. The grid width (or height if you changed your layout direction) will auto-expand depending on the raid size, or max subgroup used. If you select you want to see pets, column(s) will be added depending on if you have hunters or warlocks in your raid. Tanks will be shown if you enable the option AND Blizz/oRA/CTRA tanks are set. You can change the sort order of the classes, pets & tanks. You can also change the number of units in each column. For example, you could set it to 20 and in AV you will see 2 rows of 20.