Please take a look at the following for general principles. It may or may not be a bit overwhelming, but we can work through the principles and details.
The key to this is to visualize the Position keyframes set by the PiPs and then move the 2nd keyframe close or further away from the initial one.
I will be back within the next 2 hours or sooner with screenshot specific to this one PiPs 25% UL. What PiPs 25 % UL are you using - many choices.
To be continued....
From your description in your thread question, I am understanding that you are using the PiP 25% UL Scale Up to Full.
The principle is going to be the same. In this case, we are pointing to the Scale Keyframe.
I have dragged the PiP 25% UL Scale Up to Full into the jpeg on Video 1. Then I opened Applied Effects/Applied Effects Palette/Motion Panel expanded and open the Show Hide Keyframe Controls, See my screenshot in the blog post cited previously in your thread. There will be 2 Scale Keyframes. The second is hard to see, but it is there.
For faster PiP, move the second keyframe closer to the initial one.
Please let us know if that worked for you.
Any questions or need clarification, please let us know.
This is exactly what I was looking for, thanks for lesson ATR, worked as described!
Thanks for the great news. Glad that the suggestion worked for you. Well done.
Best wishes with your Premiere Elements projects. Please do not hesitate to ask if you have questions about your Premiere Elements workflows.