Has anyone else noticed that the zoom setting for images in the Snagit Library window seems to change arbitrarily. I'll set it to a size that's readable (using ctrl-+), go back to the Editor Window, then back to the Library window and they're back to tiny again. VERY annoying.
Just played around a bit with my copy of SnagIt 2019 by opening an image, going to the library and resizing to 150%, switched back to the editor then back to the library and the image previews remain at 150%. Closed the editor and re-opened and previews are still at 150%. Exited SnagIt altogether and restarted and opened editor and images are still at 150%. I can't explain your software behaviour. I don't see anything in the editor preferences that would suggest a control for it.