Standard Quick Zoom+Pan (Shift + Mouse Right click) and Zoom + Drag (Shift + Left click) does the same thing, but without separate navigator subwindow.
Also you may find quick zoom (Z) useful in combination with mouse pointer (check Preferences - Zoom - Zoom anchor at mouse cursor to zoom at point pointed by mouse).
Zoom ratios for all zoom functions mentioned are separate tunable via Preferences - Zoom settings.
Standard Quick Zoom+Pan
Standard Quick Zoom+Pan (Shift + Mouse Right click) and Zoom + Drag (Shift + Left click) does the same thing, but without separate navigator subwindow.
Also you may find quick zoom (Z) useful in combination with mouse pointer (check Preferences - Zoom - Zoom anchor at mouse cursor to zoom at point pointed by mouse).
Zoom ratios for all zoom functions mentioned are separate tunable via Preferences - Zoom settings.
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Alex Tutubalin/FastRawViewer team