OpticStudio uses a layout manager to determines how to position and resize the windows. This manager can sometimes go into a state where the window of an editor/analysis take a default undesirable shape.
This thread idea has been suggested and co-written by Dusan Zadravec.
One or any of the fixes described below can usually solve this problem:
Try docking and undocking the window
Delete Lens.ZMX and Lens.ZDA in the \Zemax\Samples\folder\
Delete the associated ZOS session file (*.ZDA) and Ray Databases (*.ZRD)
Verify the window sizes in the Project Preference under Editors and Graphics
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