You have several options for saving content in Threat Lens:
Download a PDF: When on a content page, in the Tools section on the right click the icon next to Download to generate a PDF. It will open in a new browser tab with the PDF, that you can print or save.
Printing Content: You can print from the content page by clicking the print icon in the Tools section. It will open a print dialog box with the configuration options available on your device.
Bookmarking: You may bookmark content on individual article pages and then view those bookmarks in your Library at any time.