The HomeKit Accessory Simulator window is divided into two sections:
The accessory list displays the accessory name. There is also a circle that indicates several pieces of information:
For IP camera and video doorbell accessories, the circle additionally indicates:
The bottom of the accessory list contains a "+" button on the left and a "-" button on the right. The "+" creates accessories and bridged accessories; and the "-" button deletes them. Any IP accessory can become a bridge accessory by adding bridged accessories to it.
When selecting an accessory other than a bridged accessory, the top area of the main view displays the Setup Code, Category, configuration number, the number of paired devices, etc. This information does not exist for bridged accessories, as they are paired via their bridge.
When selecting any item, the top area of the main view shows characteristics included in the accessory's Accessory Information Service. This top area's upper-right corner can be clicked to collapse or expand the area.
The bottom of the main view contains additional services for the accessory.