Help With End Of Generator

I'm trying to create a line similar to this Motion project as a generator in Final Cut Pro 10.3.4. I'm using Motion 5.3.4.

I have everything in place and I just need to know how I can keep the generated image on the screen at it's end frame until the end of the video. In other words, after the image is generated I need it to remain on it's last frame until I decide to end it.