The saturation indicator at the top of the screen changes from green to yellow to red as saturation increases. When the first red/orange dots appear, you may see an indicator requiring Deep Stops, even though there is still no-decompression time remaining.
The Ascent Rate indicator (right center here) will sound and flash a SLOW! alert if a too rapid ascent rate continues for more than 10 seconds.
This screen also illustrates diving with EAN (Nitrox). The selected gas (here EAN 32%) is shown above the pressure. When diving with EAN the current PO2 (partial pressure of O2) is shown below the gas time.