When using a Mac computer we recommend making changing your settings to allow scrollbars to always display.
By default Mac computers will only show a scrollbar if you are hovered over a area that has scrolling content or if you are actively scrolling.
Windows users will always see scrollbar if there is an area that has scrolling content, so making your scrollbars always visible will help you better understand what your Windows viewers will see when viewing your presentations, which in turn will help when you are editing and building your presentations and slides.
Step 1:
To make it so scrollbars are always visible, open your System Settings.
Step 2:
Within the System Settings locate and open the Appearance settings.
Step 3:
Within the Show scroll bars settings area click the Always radio button.
Note: scroll bars may not be displayed if your master style css code is hiding scrollbars.