To apply transitions between your scenes, follow these steps:
Step 1: Go to the 'Advanced Editing' screen.
Step 2: At the bottom of your screen, click on the rectangles between two scenes.
Step 3: Hover over the transitions to see what effect they have.
Step 4: Select the transition that you want to apply.
Step 5: If you want to remove the transition, click on the 'x' sign over the transition.
Step 6: If you want to apply the transition to the entire video, click on the three dots and then click 'Apply to all.'
Step 7: If you want to set the default transition, click 'Set Default Transition.' Click 'Remove Default Transition' to remove it.
Here is a detailed tutorial to help you through the process: