Problem: List of services displayed in the tree view is incomplete in small screen resolutions
In small-sized display resolutions (1440 x 900 or lower), the left panel of the ArcGIS Monitor Server web page shows an incomplete display of ArcGIS Server services.
This is a known limitation.
Solution or Workaround
In Windows, change the screen resolution to greater than 1440 x 900 pixels. For instructions on how to change screen resolution, refer to the linked Microsoft Help document.