This question comes from a reader of the Notion course. It has been organized and shared here. If you encounter similar issues while using Notion, feel free to leave a comment.
Problem Background
- A Notion database has Sub-items mode enabled
- Every time the page is refreshed, the sub-items collapse, requiring you to manually expand them each time you view the page

Solution
Add a filter condition with the criteria "Parent item: Is not empty"

This way, even after refreshing the page, all sub-items will remain expanded:

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