To see the volume weighted aggregate price from across all exchanges for any given currency do the following:

Step 1: Go to the quote screen. (The quote screen shows information such a price, volume, high, low, open, market cap, etc.)

Step 2: Tap the button that shows the current exchange and currency (for example, 'Coinbase - USD' and simply select one of the top options called, for example "Market Aggregate - USD" or "Market Aggregate - EUR", depending on your preferred denomination.