Create a custom TOC

Here is my take on a custom table of contents menu. https://youtu.be/pm3qOekdsZ4

Another alternative is to simply make a separate slide for a Table of Contents and have buttons that "jump to slide" to your particular sections. Then have a Menu or Table of Contents button on your navigation panel that users can select to jump to that particular slide at any time in the course.

I hate to be the bad guy and constantly wave the accessibility flag here, but I am pretty certain hyperlinks are not up to 508 compliance standards. Unless things have changed with Captivate 2017, hyperlinks are not part of Captivate's tab order and screen readers access to them is hampered. All your hyperlinks would be skipped by any screen reader or keyboard user when they tab through the slide. Which is why I always advocate to use smartshape buttons (disable rollover/down states, No Action, disable click sound, add accessibility text) for textboxes, alt text images, etc.

And before someone chimes in that not everyone here is from the US and has to consider 508 compliance rules, I say the following. YOU SHOULD STILL BE DOING THIS. Accessibility is and should be a worldwide concern for instructional designers and elearning developers. It's not like all the people who have disabilities and use screen readers reside only in the US. There are people in Europe that use screen readers. There are people in Australia that use screen readers. In it in your best interest (and also just the right thing to do) for you to consider how much or how little your Captivate courses are accessible to individuals with disabilities and assistive technology.  It is really easy to get started. There is a free screen reader you can download immediately and start playing around with it in your Captivate courses.

https://www.nvaccess.org/download/

http://webaim.org/resources/shortcuts/nvda

Which version are you using and which output do you want?

You have to use 'Rest of Project', not 'Rest of Slide', and be sure to use the option 'Always on top'.

Not only will that bunch of TOC objects increase considerably the file size, to be able to control it you'll need to use shared actions or a multitude of duplicate advanced actions, because each TOC object will have its ID. If you use one TOC as I described, you have to deal with only one ID.

Is that X symbol a hyperlink to close the TOC? Or do you have a toggle button that opens and closes the TOC? Have a look at:

More is in a...hyperlink - Close button - Captivate blog

If you follow my recommendation to have only one TOC object, timed for the rest of the project, you have to:

• create a user variable (Boolean) v_visib to track the visibility of the TOC object; set its default value to 0
• create a conditional advanced action to check the value of the variable; that action has to be triggered On Enter for each slide:
      IF v_visib is equal to 1
            Hide TOCObject
            Change state of Bt_TOC to Normal
            Assign v_visib with 0
            Continue
     ELSE

                Continue

This action supposes that you have a toggle action for the button. If not take out the Change state command.