Timeline problem

My command line (play pause etc..) in the timeline vanished. How do I get it back?

When I add a MP4 video (Captivate 2019 updated) I can view it in preview but not in published version.

When I add a MP4 video (Captivate 2019 updated) I can view it in preview but not in published version.

Moving button!

continue button keeps moving in timeline on random slides.