In the Menu Bar, click Edit > Preferences, then on the left side of the dialog box, select Animation.

Base

Time

Sets the number of frames rendered per second of animation.

Keep Keys at Current Frames

When selected, all keyframes remain in their global position, even when changing the global time. As a result, those curves are modified. When deactivated, keys may map to a different frame when the global time value is changed.

Verify Clip Structure

When selected, unreferenced animation blocks and empty clips are removed when importing a VRED file.

Don't Show Create Curve Dialog

When selected, the Create Curve dialog no longer appears.

Playback

Playback Speed

Sets the number of frames processed per second.

Playback Range

Determines whether the full or detailed range is played.

Evaluation Context

Defines which curves are calculated. When set to Scene, all active curves and blocks are examined. When set to Curve Editor, only the curves currently displayed in the Curve Editor are examined.

Loop

Toggles playback looping. For continuous looping of playback, toggle this on.

Timeline

Full Range Start

Starts frame for the complete timeline.

Full Range End

Ends frame for the complete timeline.

Detailed Range Start

Starts frame for the current part of the timeline.

Detailed Range End

Ends frame for the current part of the timeline.