Once the LayoutEditor Web Viewer is started you can control the view with these mouse actions:
Use a Three-Button Wheel-Mouse and a modern browser like Chrome, Firefox, Safari, or Edge (but not Internet Explorer).
Please and hold the right mouse button the pan the design.
Clicking on a mask layer in the toolbar on the left of the screen with the Center-Mouse-Button will toggle the visibility of the mask.
Holding the CONTROL key and left-clicking on a mask layer in the layer toolbar will hide all other layers.
Quickly zoom in and out using the wheel on the mouse ... or by dragging a window from the top-left to bottom-right of the desired view (this also works on a mobile touch-screen device).
The Slash Key (/) will quickly show the full extents of the mask.
Click on the RULER icon in the toolbar to manually measure a feature.
After selecting the ruler icon in the menu, hold the shift and left-click on a shape to measure the extents of the shape in X&Y.
Hold down the Left-Mouse-Button while hovering over a mask layer in the layer toolbar to see additional layer options.