I’m sorry if this hasn’t made sense, I haven’t been using Sketchp for that long.
Perhaps you can help me understand why you are even interested in an isometric view. The several forms of axonometric projection, including isometric, were developed as a means to produce a pictorial image of an object as a simplified alternative to true perspective, back when it was prohibitively difficult and time consuming to draw a true perspective in most cases, although they were clearly preferable. The trade-off was, isometric views appear distorted and unnatural, although they are relatively easy to draw by hand with a 30-60 triangle.
These days, when true perspective views are easy to create from a model, why would you wish to use an inferior isometric view?
All that having been said, “isometric” means “same scale” That is, each of the three receding axes are inclined an equal amount to the picture plane and consequently foreshortening affects each receding axis equally. This means there is only one correct orientation for an isometric: namely, each normal face is inclined to the picture plane by 35°16". Normal axes are 30° above or below horizontal (depending on whether you’re looking up or down at the object), and the vertical axis is vertical.
An isometric drawing is typically made at full scale. An isometric projection is made at about 82% of full scale to account for foreshortening.
But again, this stuff really only makes sense if you’re drawing this by hand with instruments. Dumbing down a 3D model to look like an isometric drawing makes no sense to me, unless perhaps you work in a museum or are planning a trip back to the 60s. It is exactly like throwing away information you’ve already paid for.