How to find the special effects of mobile video transition?

In the clip, the search operation is as follows:

1, open the newspaper clipping first.

2. Click Start Creation.

3. In the mobile phone photo album, click to select two or more video materials and add them to the project.

4. Click on the white square between the two videos.

5. Find the "Mirror Transition" sign at the bottom of the page and click Enter.

6. On the "Mirror Transition" page, you can see that there are many mirror transition effects.