Panning can be done by dragging with MMB.
Zooming can be done using Wheel or NumpadPlus/NumpadMinus.
Also see 导航 in the Image Editor.
- 查看选定 NumpadPeriod
Change the view so that all selected UV vertices are visible.
To change the Cursor's position, either press LMB with the Cursor tool selected, or Shift-RMB with any tool selected. You can also change the "Location X/Y" fields in the View tab of the Sidebar, in either relative coordinates (0 to 1) or pixel coordinates. In both cases, the lower left corner of the image serves as the origin (0, 0).
You can press Shift-C to move the Cursor to the center.