Solution for Missing Scratch Pad After Postman Update
The new version of Postman has completely removed the scratch pad feature. If you were also affected by Postman's silent update, you can migrate your data to the new version of Postman in the following ways, although the new version of Postman is laggy and not easy to use.
Actually, many people on GitHub have discovered this problem, and there is a corresponding issue.
When we switch from scratchpad to workspace the collections are not restored
1. Direct Migration
Select Settings -> Data tab -> Select Migrate Data.

2. Migrate After Data Export
If there is no migrate data in your new version of postman, choose Export data. After exporting the data, create your postman account, and then import it to your workspace.
