Some apps such as ProPresenter put themselves at the topmost "layer", to prevent interruptions during the slideshow. We can turn this off, to allow Pager to appear in a layer above ProPresenter.
- After launching ProPresenter, click the "ProPresenter" menu, and choose "Preferences...".
- In the Preferences window, choose the "Display" tab.
- Find the check mark for "Display at Top Most Window Layer", and make sure it is not checked.