Also mention right-click option

src/docs/getting-started/quickstart.mdx

@@ -102,6 +102,7 @@ view you can:
  * Use your mouse wheel to zoom in and out (or pinch on a mobile device).
  * Click on the blue square on in the bottom left of the canvas to open the controls. Here
  you can change settings such as cut-outs (clipping, try selecting all of 'X', 'Y', and 'Z'), and transparency (under "appearance").
+ * Right-click on the canvas to show other options.
 
 ![viewer_step1](../quickstart_viewer_3.png)