To disable automatic transitions:
With your project open, do one of the following:
Add a transition to your project manually (by dragging a transition from the Transitions window to the project), and then click Turn Off Automatic Transitions in the dialog that appears. The transitions already in your project are retained.
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Choose File > Project Theme, and then deselect the checkbox for automatic transitions; the File menu appears in a light gray bar across the top of your computer screen.
Choose one of the following:
Remove transitions (or transitions and titles) and extend clip ends: Removes all transitions from the project and slightly extends the ends of the clips that were adjacent to the transitions. This option lengthens the duration of your project a bit.
Remove transitions (or transitions and titles) and maintain clip durations: Removes all transitions from the project and slightly shortens the ends of the clips that were adjacent to the transitions. This option maintains the current duration of your project.
Leave transitions (or transitions and titles) in current locations: Retains all current transitions but adds no new ones as you add clips to the project.