I guess that you are referring "Decision Register option" to this video:
According to my understanding is necessary to have this plugin:
If you are referring to the small left toolbar where you only see the icons, you can shrink the left wide toolbar with '[' or with your mouse or by clicking << at the bottom of the toolbar.
The Decision Register icon or menu option will be available once you create your first Decision. To do so, click Create, choose Decision.
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