How to use the Draw and Combine tool?

The Draw and Combine tool lets you merge multiple existing annotations of the same label into a single annotation. Whenever you draw new annotations using this tool, any overlapping regions with the same label will automatically merge together.  

To use the Draw and Combine tool, click on the Draw icon and select the Draw and Combine option or press the “C” shortcut key.

You can also edit annotations with the Draw and Combine tool enabled to combine adjacent annotations.