If you are surprised that you do not get a satisfactory answer, you may not have expressed yourself sufficiently (yet). Describe in more detail:
What is the current situation?
What exactly are you missing?
What should it look like in the end?
And what to explain the question is simple. Is it possible to add your folder to the effects of transitions between scenes to add your favorite most-used effects to it. Such a possibility is in video effects in transition effects there is no such option at least for me
If I understand (now) correctly, you want to put your most used transitions in a favorites-folder so that you don't have to search through everything every time. I do this with the plug-in manager, where you can create a favorites-folder yourself.
It is a bit tricky, because in my opinion it does not program 100% Windows-conform and is not described in the manual. 1.) Mark "transitions" 2.) Create a new folder using the button (above) 3.) Leave the cursor on "Transitions" (so that All transitions are selected) 4.) Search for the transition in the right field (use slider if necessary) 5.) Drag and drop your transition into the "My favorites" folder.
If another folder is selected (32-bit floating point, third-party provider, etc.), drag and drop does not work.
Edit: @3POINT was faster! He taught me in a German forum a few days ago 😊😊😊