If you deleted a Topic from your meeting by mistake, you can access the texts it contained via the meeting history:
Click on the ⋮ button at the top right in the blue banner
Click on History
Locate the line that mentions the deletion of the Topic and click on the View Latest Version link
Under the Text Changes tab, you will access the raw text blocks (paragraphs and decisions) of the deleted Topic.
Under the Version overview tab, you will find a complete overview of the deleted Topic.
How to restore a deleted Topic ❓
Create a new Topic from the table of contents of your meeting
Access the history
Copy the text to restore
Paste the text in the new Topic created