Draw New Sub-Space

Click the [Edit Space Mode] button.

Note: If you are adding a new sub-space to the primary space, be sure the existing sub-spaces are resized to allow room for a the new sub-space. While in "Edit Space Mode", the cursor changes to a double arrow when placed at the edge of a sub-space indicating the ability to resize the selected space.

It is possible to add (nest) a new sub-space inside of an existing sub-space.

Click the [Draw New Sub-Space] button. The cursor loads with a + when hovering over a space which indicates the tool is enabled for drawing.
Click and drag in the Plan workspace to add the new sub-space. A sub-space can be nested inside another sub-space if desired.
Click the [Draw New Sub-Space] button or press Escape (Esc) to disable tool.
To exit Edit Space Mode, click the [Edit Space Mode] button again.