If the Chrome debugger (“Inspect”) is “docked” (i.e., not shown as a separate window, but as a panel within the main browser window), then the display of the debugger panel reduces the space available for rendering the TiddlyWiki content.
If that space is less than a certain width (see $:/ControlPanel > Appearance > Theme Tweaks, “Sidebar breakpoint” setting, default=“960px”), then the Sidebar (“Right of the River”) content is automatically shifted to appear ABOVE the StoryRiver content. As a result, the search box (and any popup list of tiddlers it displays) will overlap with the StoryRiver. The same effect also occurs without the debugger panel if you just resize the browser window enough to reduce the width below the “Sidebar breakpoint” value.
To avoid this, you can “undock” the debugger panel so that it appears as a separate “DevTools” window, without using up any space in the main browser window. To undock the DevTools window, click on the “three dots” button in the upper right corner of the Inspect panel. This will show a drop-down menu. The first item in this menu is the “Dock side” setting which shows four icons: “undock”, “left”, “bottom”, and “right”. Select “undock”.