1. On the event dashboard, click on "Agenda" from the left sidebar menu.
2. Under Agenda, Go to Thumbnail tab to configure thumbnail settings.
3. Click "+New thumbnail" to add thumbnails.
4. Upload the image in the upload area.
5. You have the option to Crop and use the selected image as the thumbnail.
6. You also have the option to name the thumbnail.
7. Click on "Create thumbnail" to add it in the thumbnail section so we can use it for the desired session as a thumbnail.
8. Now to assign the uploaded thumbnail to a session. Go to "Sessions" tab.
9. Select and click on the session on which we need to add the thumbnail.
10. Click on the "Pick a thumbnail" Dropdown to select the thumbnail uploaded we have the option to search the thumbnail with the given name.
11. Once the thumbnail is selected, click on save to save the changes made.
