From the home screen open the ‘Settings’ menu.

Select ‘Powerwall’ at the top of the screen.

You can adjust your backup reserve for outages. A higher reserve will reduce utility bill savings in areas where using stored power outside of outages is incentivized. 20% is often recommended. For Operational Mode, choose ‘Self-Powered.'

If you have Powerwall 3 or Powerwall+, be sure that "Permission to Export" under "Advanced Options" is set to "Yes."