In the publication of an interactive project, Captivate includes an image, with a size and an interactive area for the start click. If I'm not mistaken, there is a specific hot area to click on the image and I think it is not modifiable.
It is the case that the project visualized in mobile, in vertical format, the image and the hot area are below the visualization and the user would not know what to do.
This can be modified.
Have a look at this blog post:
You can also resize the click area, even to the ful size of the slide.
However it is NOT normal at all tthat the Play button would be outside of the screen, even on mobile devices. It is exactly in the center of the start slide. How did you publish, please and which version are you using?
I do not know if I have explained myself correctly.
I am not referring to the specific size of a slide.
As you know, in new projects, browsers require a click before starting the project.
That click and its image has it set Captivate by default (attached folder with the predefined image) in its configuration. The image can be customized, but I do not know if you can create a click area for the project to start.
I posted a link where I explained a lot, did you read that post, please?
And answer the question: are you publishing a non-responsive project or a responsive project. If it is responsive, which method did you use: fluid boxes or breakpoints. Which version are you using.
My project is interactive, responsive and designed with fluid boxes.
Anyway, the same thing happens in the projects of breaking point.
My version of Captivate is 2019