How to refresh files tree?

How to refresh files tree ? is there function ? method ? anything

The problem : I’m working on developing a plugin for Obsidian and have encountered an issue. When I create a folder named ‘oo-soso’, it is successfully created and visible in the file tree. However, when I add another folder, ‘ssss-soso’ (as shown in the attached image), the ‘oo-soso’ folder disappears from the file tree. Interestingly, it can still be found using the system file explorer.

Screenshot from 2023-12-25 22-05-22