To generate high-quality thumbnails:
- Go to Gallery -> Manage Gallery
- Click on the gallery that the thumbnail is in. For example, if the thumb is on the Idea Gallery page, in the Details carousel, select ‘Idea Gallery – Details’
- Check all the thumbnails that are low resolution (fuzzy) and from the ‘Bulk actions’ dropdown, select ‘Create new thumbnails’.
- Enter the correct thumbnail image size. Apply.