Adding transitions
There are many types of transitions in the Library. For every type, you choose a specific preset effect by using the thumbnails. For example, you can choose from popular transition styles such as Dissolve, Crossfade, and Fade to black. Camera Movement transitions simulate cinematic camera-style effects.
To add a transition
• In the Library, click the Transitions category button 
and select a transition category. Scroll through the transitions in the Library. Select and drag a transition thumbnail between two video clips in the Timeline. Drop your transition and it will snap into place. You can only drag and drop one transition at a time.
and select a transition category. Scroll through the transitions in the Library. Select and drag a transition thumbnail between two video clips in the Timeline. Drop your transition and it will snap into place. You can only drag and drop one transition at a time. • Double-click a transition thumbnail in the Library to automatically insert it into the first empty transition slot between two clips. Repeat this process to insert a transition at the next cut. To replace a transition in your project, drag the new transition onto the transition thumbnail for replacement in the Storyboard View or Timeline View.
To add a transition automatically
A default transition is always added automatically between overlapping clips, whether the Automatically add transition effect in Preferences is enabled or not.
To add a selected transition to all video track clips
2
Click the Apply current effect to video track button 
or right-click on the transition and select Apply current effect to video track.
or right-click on the transition and select Apply current effect to video track. To add random transitions to all video track clips
.To customize a preset transition
For flawless, cinema-grade transitions between scenes, set the default transition duration to 0.5 seconds or lower.
To change the default settings for transitions, click Settings > Preferences > and click the Edit tab. In the Transition Effect area, do one of the following:
• Choose a transition effect from the Default transition effect drop-list or choose Random to insert transitions from a preset list in random order. If you choose Random, click the Settings button to customize the list of transition effects. In the Customize random effects dialog box, enable the check boxes of the effects that you want to include in the list.