Hiding unused panels in Lightroom
To toggle the visibility of a panel, Control -click (Mac) | Right -click (Win) on the panel header and select/deselect them from the list.
There are a few panels that can’t be hidden (although their contents can still be collapsed using the disclosure triangle). The exceptions are:
• Library and Develop Modules: Navigator and Histogram Panels
• Map Module: Navigator and Metadata Panels
• Book, Slideshow, Print, and Web Modules: Preview Panel
In the Develop Module, Control -click (Mac) | Right -click (Win) on any panel header on the right of the screen (except the Histogram panel), and select Customize Panels Option to toggle visibility as well as reorder the panels.