Here is a summary on how to rotate, zoom and pan.
3D Rotate: Right-mouse-button-click+drag
Zoom in and out: Scroll up and scroll down, respectively
2D pan: CTRL-right-mouse-button+drag (middle button click+drag)
3D Rotate:
Rotate 15 degrees: arrow key
Rotate 3 degrees: Shift + arrow key
Continuously rotate: press and hold arrow key
Zoom in and out:
Zoom in: Shift+z
Zoom out: z
2D pan:
Ctrl+Shift + arrow key
3D Rotate: Right-mouse-button-click+drag
Zoom in and out: Pinch out and pinch in, respectively
2D pan: CTRL-right-mouse-button+drag
3D Rotate: Right-mouse-button-click+drag
Zoom in and out: Scroll down and scroll up, respectively
2D pan: Ctrl+RMB+drag (middle button click+drag)
3D Rotate:
Rotate 15 degrees: arrow key
Rotate 3 degrees: Shift + arrow key
Continuously rotate: press and hold arrow key
Zoom in and out:
Zoom in: Shift+z
Zoom out: z
2D pan:
Ctrl+Shift + arrow key
3D Rotate: Two Finger-click+drag
Zoom in and out: Drag two fingers toward you and away from you, respectively
2D pan: CTRL - Two finger click (and release one finger) + drag
One of the most important gestures to know is tap and hold. If you tap the screen and hold your finger for a moment, the Precision Selector will appear. This is the tool to use when selecting small details. It’s useful throughout the Onshape Mobile app if you need to select a small sketch entity, select an edge for a fillet, or select a part to rotate in the assembly.
If you tap the screen with two fingers it will bring up a context-sensitive menu of options to choose from. This is the same menu that you would see if you were right-clicking when using Onshape in the browser. Anything from editing sketches and features to change appearances and much more is accessible via the two-finger tap menu.
If you double tap the screen it will deselect any selected entities. This is especially important when you have a number of entities selected and want a quick way to clear all the selections.
Tap the workspace screen with one finger and drag around to see your objects from all angles. This was called orbit in AutoCAD.
Tap the screen with two fingers and drag your fingers apart to zoom in and drag them together to zoom out.
Tap the screen with two fingers and drag across your screen to pan (move) your view of the object around the screen. This will also 3D rotate at the same time if you move your fingers slightly. You can lock the view in place first (upper right corner of the workspace) if you want to stay at a certain view before you start panning.
Activate the keyboard shortcuts map right in the user interface by pressing the Question mark key "?" on your keyboard when in a document. You can even pop it out of the window for continuous display:
For more details, see Onshape Help Section
Onshape selection works like a toggle. Click to select, click again to deselect. You are also able to click to additively select and deselect.
Specifically:
The cursor displays a count of selected entities; the displayed cursor count is accurate up to 5 entities (after 5, the cursor maxes out at 5+).
Selection may be made with the cursor on a specific sketch or part entity (sketch curve or part edge, for example) and also by dragging a selection box around or across entities. Selected entities in the graphics area are highlighted. To deselect all selected entities, click in the white space in the graphics area or access the context menu and select Clear selection.
Drag left-to-right to select the entities that fall entirely within the box (indicated by solid blue outline and blue-shaded selection box):
Notice that despite the selection box having crossed the cylindrical shaft, it was not selected (above).
Drag right-to-left to select the entities that the box touches (indicated by dotted yellow outline and yellow-shaded selection box):
Notice that this time when the selection box crossed the cylindrical shaft, it was selected (above).
Besides moving the model within the screen, you can also change its appearance. Beneath the View Cube is a small View Cube icon, and within that menu is a variety of different ways to view the model. As the models get more complex, these visibility tools are helpful in allowing us to inspect and review our geometry. Here is a quick overview: