Turn Slide Timings Off. Hover over the right edge of the slide objects duration so that a pull icon displays then click hold and drag to adjust the time. Do step 5 enable or step 6 disable below for what you would like to do.
Another way to change the duration is to click Timeline at the bottom-center of the Captivate window. It is more than likely you have set timings to many or all of your slides in P. Thats right when you select By User the learner must click the Next button to move to the next slide.
To advance the slide after a specified time in the Timing group enter the number of seconds that you want in the After box.
With nothing selected on the slide go to the Properties Inspector and click the Timing tab to change the Slide Duration. With nothing selected on the slide go to the Properties Inspector and click the Timing tab to change the Slide Duration. To advance the slide when you click the mouse in the Timing group select the On Mouse Click check box. Select Set Up Slide Show.