Where is the threshold for "Automatic Power Saver" in settings?

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The “Automatic Power Saver” only has an on/off toggle and the description “Turn on power saver mode when battery power is low”…

What does “low” mean in this context? Is it a certain percentage of remaining battery power? Can it be changed?

I am hoping some Gnome expert can provide commands to review/edit it via dbus (even if it is not exposed in the GUI), or that there is perhaps some extension that allows for better control?

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This is handled by upower daemon in this file: /etc/UPower/UPower.conf
When the battery reaches the PercentageLow value (default 20), power saver mode turns on.
If you change such value, you have to restart the service:
sudo systemctl restart upower

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