When I deleted few task, how can I get them back?

Hi Serge, thank you for reaching out here! When tasks are deleted, they go to the Recycle Bin. If the Recycle Bin hasn't been emptied, you can restore these tasks:

1. Open the Recycle Bin by clicking on it in the Navigation panel.
2. Click on the task you want to restore.
3. Click "Restore" at the top of the Task Panel on the right of the Workspace.

Let me know if you have any questions about this!