The manual often only states examples, while some features are undocumented.
In the manual I can find nothing on axis control (ranges etc.) in plots for example. Yet the possibility is there.
Constants is another topic (and one of the topics that made me pay money for the app). The manual gives 4 examples, yet there are more, I just don't know which. @(planck constant) did work, neither @(elementary charge) nor @(elemental charge) did work. So am I to just guess? That's not easy, especially for a not native speaker.