The Status bar appears at the bottom of the Autodesk Navisworks screen. It cannot be customized or moved around.
The right-hand corner of the Status bar includes four performance indicators that give you constant feedback as to how well Autodesk Navisworks is performing on your machine, a button to toggle the Project Browser window, and controls to navigate between sheets/models in multi-sheet files. 
Multi-Sheet Navigation Controls
Click the previous/next and first/last arrows to open the desired sheet/model in the Scene View. This is equivalent to double-clicking the sheet/model in the Project Browser window. The sheet/model will be automatically prepared for use in Autodesk Navisworks, if applicable.
Project Browser Button
Click the Project Browser 
button to toggle the Project Browser window.
Pencil Progress Bar
The progress bar under the left hand icon (pencil) indicates how much of the current view is drawn, that is how much drop-out there is in the current viewpoint. When the progress bar is at 100%, the scene is completely drawn, with no drop-out. The icon changes color when a redraw is in progress. Whilst the scene is being drawn, the pencil will change to yellow. If there is too much data to handle and your machine cannot process this quickly enough for Autodesk Navisworks, then the pencil changes to red, indicating a bottleneck.
Disk Progress Bar
The progress bar under the central icon (disk) indicates how much of the current model is loaded from disk, that is how much is loaded into memory. When the progress bar is at 100%, the entire model, including geometry and property information, is loaded into memory. The icon changes color when a file load is in progress. Whilst data is being read, the disk changes to yellow. If there is too much data to handle and your machine cannot process this quickly enough for Autodesk Navisworks, then the disk changes to red, indicating a bottleneck.
Web Server Progress Bar
The progress bar under the right hand icon (web server) indicates how much of the current model is downloaded, that is how much has been downloaded from a web server. When the progress bar is at 100%, the entire model has been downloaded. The icon changes color when a file load is in progress. Whilst data is being downloaded, the web server changes to yellow. If there is too much data to handle and your machine cannot process this quickly enough for Autodesk Navisworks, then the web server changes to red, indicating a bottleneck.
Memory Bar
The field to the right of the icons reports the amount of memory currently being used by Autodesk Navisworks. This is reported in Megabytes (MB).