Presentations don't really use themes, and they're not presented through OpenLP anyway (3rd party integration is used, such as PowerPoint, Impress, etc). I believe in the past it was a bug that allowed the Theme toggle to appear while a presentation was being displayed. I recall that trying to toggle the theme view during a presentation resulted in an immediate crash of OpenLP, although I don't recall if I was using Windows 7 or Ubuntu or Windows 10.<br><br>If you need to show theme-only to switch presentations, put a blank slide at the start/end of your presentations. Alternatively, you can create a Custom Slide with no text and apply a desired theme to it, then place it in the service manager between the two presentations. If your "theme-only" view is black, use the "Blank to Black" (period) toggle.