Ok, I try it in english (sorry for mistakes in advance)
when I do the following while making a video :
text -   piece of a video  (via "crossover" ) -  text-  piece of a video -  and so on,
then the outcome of the video is much smaller than the original video
If I put  the same video at the beginning, then the outcome size of the video is normal.
any idea ?
I have trial version 5.2