Close button not appearing in a new Lightbox slide

The X button only appears when a slide is lightboxed. That's because the program needs a way to close the lightbox so the user can continue the course. 

• FYI: The default setting for lightboxes is that the NEXT and PREV buttons don't show in the lightbox. There is an option to show the Player buttons in a lightbox. When that's done, the NEXT and PREV buttons are typically given custom triggers to prevent the user from advancing to slides in the lightbox that you don't want them to. 

The default trigger for the NEXT button is to jump to the next slide.

• "Jumping" to a slide shows it in the standard mode, that is, the slide within the Player. 
• Which slide is "next" is based on the slide numbers within a scene.
  • Note: A "jump to next slide" trigger won't go anywhere from the last slide in a scene. In those cases, the trigger needs to jump to a specific slide or it needs to be a "jump to scene" trigger. 

Thus, if the slide you lightbox is within a sequence of slides using the default "jump to next slide" trigger, then that slide will appear as a regular slide when you click NEXT from the slide before it in the sequence.

One way to prevent that is to edit the NEXT button trigger on the previous slide in the sequence so it jumps to the specific slide you want it to. 

When I have slides that will be lightboxed, I typically put them in a separate scene. And the only triggers that access those slides are "Lightbox slide __" triggers. Doing that lets you keep the default "jump to next slide" triggers in the main scene.

• With this method, you have to include the lightboxed slide when you Preview the course. The program can't jump to or lightbox a slide if it isn't included in the slides being previewed. 

For information about basic functionality in Storyline, I recommend bookmarking the User Guide: https://community.articulate.com/series/articulate-storyline-360