# Viewer Controls

## Video area controls Use the following controls to control playback, adjust the video and volume settings, and display or hide closed-captions and links (if available):
Item | Description
Trackbar | Drag the trackbar to seek through an on-demand or portable presentation.
| Play | Click to resume playback after stopping or pausing the presentation.
| Pause | Click to suspend playback.
| Stop | Click to halt playback.
| Full Screen | Click to enlarge the video to fill your monitor.
| Mute | Click to turn off the presentation's audio. Click again to turn it back on.
| Speed | Move tab to increase or decrease playback speed.
| Volume | Move tab to increase or decrease volume.
Show/Hide Captioning | Click Show Captioning to view closed-captions below the presentation's video. Click Hide Captioning to conceal the closed-captions.
Info | Click to view information about the presentation: title, presenter(s), date, and time. Click Details below the presenter's image to view the presentation's details in a separate window.
Links | Click to view links to websites or documents associated with the presentation.
## Slide area controls Use the following slide controls to navigate through the slides or adjust how the slides are displayed:
Item | Description
| Show Original Size Slide | Click to playback the slide show using the original slide size in a separate full-screen window.
| Slide Image | Click to view slide images in slide area.
| Slide Description | Click to view slide descriptions. Slide descriptions can be read by screen readers.
| Thumbnails | Click to view slides as thumbnails (small images).
| Text Slide List | Click to view slide titles. The text slide list can be read by screen readers
| Chapters | Click to view list of key points in presentation. Chapters can be read by screen readers.
| Change Thumbnail Size | Move tab to increase or decrease thumbnail image size (only when viewing images as thumbnails).
| Play from Beginning | Click to start presentation at the beginning when viewing slides as thumbnails.
| Previous Slide | Click to navigate through the slides in an on-demand or portable presentation.
| Next Slide
## Polls and questions
Item | Description
| Click to see the polls in a presentation.
| Click to ask a question when viewing a live or on-demand presentation.
## Live presentation indicator
Item | Description
| When a presentation is being broadcast live, the live presentation indicator will flash red.