Two-thirds safety margin
From the app’s English Help & Guide · Reference release 1.0.19
Overview
Enable Two-Thirds Safety Margin in More › Budget. It caps the planning budget at 66% of your available spoons, leaving one third as a buffer for unexpected energy costs. If your budget is 12 spoons, you plan with 8.
This is useful if you often finish the day over budget because small tasks, sensory load, travel, or interruptions add up. Turn it off any time if the cap feels too restrictive.