We no longer backport fixes to the package. Please use 2021.3 LTS or higher for new fixes on the UI Builder.
How to reproduce:
1. Open any project
2. Create > UI Toolkit > UI Document
3. Double-click on the new UI Document
4. Add a new ListView to the hierarchy and click on it
5. Observe the UI Builder inspector window
Expected result: Parameters with checkboxes are aligned equally
Actual result: Checkboxes are not aligned equally