When editing a preset, you can also use the 'Reset to last saved state' button. It is on the left of the 'Save current settings to selected preset' button at the right of the 'Presets' panel.
After you click on it, all last saved settings will be restored.
Also, you can use the context menu to restore settings. To do this, right click on a needed preset and select the 'Restore settings' item.
Note: When you move the cursor over the sequence of presets, the 'Reset to last saved state' button will appear on a thumbnail of the current preset (marked with '*' sign), if any changes have been made. You can use it the same way as the button located at the right of the 'Presets' panel.