Must Change Settings

Edit > Preferences > 

Timeline

Video Transition Default Duration: 10 Frames

Audio Transition Default Duration: 2 Frames

Still Images Default Duration: 1.00 Seconds

Timeline Playback Auto-Scrolling: No Scroll

At playback end, return to beginning when restarting playback: False/Unchecked

Media

Default Media Scaling: Set to frame size

Audio

Play audio while scrubbing: False/Unchecked