Choose a Campaign Builder skin to customize your work space, and use the automatic positioning icon to lock/unlock the positioning of your panels.
Click on your avatar in the top-right corner of your screen, and then click on either Light Theme or Dark Theme from the dropdown menu, depending on which one is currently in use.
The Dark and Light Themes simply skin the Campaign Builder; there are no differences in features or functions between the two.
By default, automatic positioning is turned on. This places your Campaign Builder panels on the left and right sides of your screen, as shown below - the Add Widgets Panel appears in the top-left corner, the Edit Widgets Panel in the bottom-left corner, and the Style Panel on the right side:
If you'd like to position or resize the panels in a way that works better for your personal workflow, just click the lightning bolt icon in the top-left corner of the Campaign Builder.
With automatic positioning turned off, you can re-position and resize the panels in any which way you'd like.
To automatically return the panels back to their default positions, just click the lightning bolt once again to turn positioning back on.