In the Project Browser, each control has a “hide” button (icon), and clicking it will hide the control. The icon then becomes disabled - it should become a “show” icon instead. For now, you need to select the control and click “Visible” in the properties window.
Also, the properties window has two buttons “Visible” and “Hidden” - which can NEVER both be active. Given that there is already a lot of scrolling needed, shouldn’t these be replaced by a single button which can change from the current state (or a checkbox) ?