Do not display WebUI internal state variables

While constructing a custom search form, I have associated a search form with a left menu entry.
In the customisation of this left menu try (Designer, UI, Left Menu Items), there is an arrow toward the bottom that enables to display rarely used properties, such as "visible".
Selecting "visible" for instance makes the paginated search result form not to render in FF or Edge, and rarely display in Chrome.

Internal properties of WebUI should not be given as a user choice.