When viewing the Document Library Follow Method the Dashboard provides which allow you to specify how to open files when clicking on a filename link.
The options allow you to specify how FollowCol Dashboard should try to open Microsoft Office documents (Word, Excel, PowerPoint, OneNote) when clicking on the filename link on the Dashboard and also whether to open (any) files in a new tab/window. This option can be very helpful since the device/browser that you are using for FollowCol Dashboard may or may not have Microsoft Office installed and it may not be default to the correct behavior resulting in errors when opening these file types.
The options allow you to select a preference on how to open Office documents per device / browser. "Device" really means a specific browser on a desktop, tablet, or phone. So, for example, if you use both Internet Explorer and Chrome on the same desktop, each browser can have its own setting. These options initially default to the User Option setting "Open Office Documents and Files Default" but can be overridden on the Dashboard for each device that you use.