If you are using the default collection (with VST3) plugins, they are sorted according to what the manufacturer has coded into them (most often by vendor). i.e. it works like before we had the plug-in manager. To really get the most use of this, you should set up your own collection! It may, initially, take some work, but it’s definitely worth in it the long run.
I have set up a Collection (sorted by effect type, as that is what I prefer) with folders according to type (delay, Compressors, Reverb, etc.). At the end of the list I have a folder named Archive, witch in turn contains folders sorted by the same types.
I store the plug-ins I use on a daily base in the top set of type folders. I also store all my plug-ins in that I rarely use in the sub-folders of the Archive folder.
That way, the plug-ins I rarely use doesn’t clutter up my list in the Insert/Sends tabs. Nevertheless, they are readily accessible, should I need them.
Furthermore, you can have duplicate instances of the plug-ins, in your personal collection(s). Take, for example, a plug-in that includes an EQ and a Compressor. This means that the plug-in can be “filed” under both EQs and Compressors! This is very useful. I also “file” the plug-in I use routinely both in the top folders and the Archive subfolders.
I have set up a similar collection for VST’s. I have found that organizing the plug-ins like this, greatly speeds up my workflow.
To my mind, giving us the ability to organize the plug-in in a way that suits us, and not the vendors, is one of the most important features Steinberg has implemented in a long, long time. Now, if they only let us rename them aswell.
One more important tip. Make a textfile with your set-up. This will make it much easier to rebuild your collection(s), if required. (As it was, when I replaced my system HD with an SSD.)