Hi,
In PTE AV Studio 12, we've included a new function - Quick Search in the Slide Styles window and Transitions window.
This allows you to quickly find or filter the desired transition or style by name, category, or author name. You can also filter slide styles by the number of images they require, making it easy to find styles that match your current selection.
PTE AV Studio remembers your choice during the current session, independently for styles and transitions.
You can hide the Quick Search bar in Preferences > Templates tab by unticking the "Search in styles and transitions" option.