The slideshow normally displays the name of the presentation in the bottom right corner, but this can be hidden for both Share Links and links in emails.
For Share Links, ensure the option to 'Hide Name in Slideshow' is checked. You can change this setting at any time to display or hide the presentation name in the Slideshow.
For links sent in emails, ensure the 'Hide Presentation Name in Slideshow' is checked when sending the email.
You can change this setting at any time using the Sent Emails feature. Just select the email that you have sent, and check or uncheck the 'Hide Presentation Name in Slideshow' option.
