Can I turn off "mobile" layout?

By default, the Showkase menu changes when the user's browser window becomes narrow (or on a mobile device where the screen width is already limited).
In Boma, the menu moves from side to top and in Kosel, it auto-hides under a menu icon. (This is designed to use the limited available space on small screens as best as possible.)
This behavior cannot be changed in the Showkase interface and may be difficult to change in the source code (with each theme and page-type needing to be considered).

If you want your Juicebox-Pro galleries to look the same in desktop browsers and on mobile devices, you can force the galleries to be displayed in Large Screen Mode by setting Screen Mode to LARGE in the 'General' section of the gallery settings page.
For more information about how Juicebox adapts to different devices and screen sizes, please see here.