Probably by the end of this weekend, the new version of the software will be released which will contain an optional left-panel. That left-panel will contain, inter alia, a sub-section “concepts” that will either show all the concepts available to you (in any folder accessible to the current user), or all the concepts present in the currently shown document/binder/Q&A.
When you hover over a concept/datafield, you will see relevant details (concept labels, predefines, etc.). And when you click on a concept/datafield, and your cursor is currently blinking inside an editor, the #concept or #concept^datafield will be inserted.
In the screenshot (rough preview!) below you the option is enabled to organize the concepts by category (labels with grey backgrounds at the top).
By the way, this screenshot shows our demo-account, which contains a huge list of concepts, from very diverse documents (we should clean it some day…). Most users will not have such a large list of concepts/categories.