Reproduction steps:
1. Create a new Project
2. Search “Main Camera” in the Hierarchy window (can be any keyword)
3. Press the “Open in Search” button near the search bar or press Ctrl+K
4. Save the search by pressing “Save project”
5. Open the newly created search index in the Search window
6. Enter “Grid View” and add any additional columns
7. Close and reopen the Project
8. Open the Search window by double-clicking on the created search index
Expected result: Added columns stay
Actual result: Added columns do not appear anymore
Reproducible with: 2021.3.19f1, 2022.2.7f1, 2023.1.0b5, 2023.2.0a3
Can’t test with: 2020.3.45f1 - No Search window
Reproducible on: Windows 10