Adobe Photoshop Elements 2019 Folder disappears.

Many thanks to everyone for the good answers I can now use.
The good explanation of Explorer and the organizer does not show the same folder tree. Is good as background knowledge.

Adobe elements 2019. With the Folder in the left panel, I create a new folder and give it its name.

When I look for it to use it, it's gone.

I don't see it anymore. But if I look under my image folder with file explorer then the folder exists.

Can I get a suggestion on how to make the folder visible in my panel?

Can I also get a suggestion on how to search folders?

You can search for anything else 

By @timod671320

It helps to understand why the Explorer and the organizer don't show the same folders tree.

Additionally to the two good answers from @Greg_S. and @Monte307 , just check that you can always get to the Explorer view from right clicking a folder and choosing 'display in Explorer'.

The main reason is that the organizer is based on catalogs NOT on folders. You are working within files managed in catalog(s), most of the time in a single catalog, but you can have several catalogs. Just like filenames and disk location, the folder location of each file is stored in the catalog.

The result is that the organizer is able to reconstruct extremely rapidly the folder tree of all the files of the catalog, even if it has several hundred thousands of files.

That reconstruction is independent from what happens externally in programs running at the same time or not.

It's independent from the folder structure seen from another catalog;

It only manages file types meaningful to the organizer, not the huge number of non relevant files of your computer.

So, that 'folders' view made from the data in the catalog is extremely fast, and it guarantees that it is always coherent with the catalog in use.

A good side effect is that the reconstruction of the folder tree will make visible a number of  'disconnections' created from outside of the organizer (from the explorer) or even creating from using another catalog.

In addition to Greg's solutions, if you add an image to that folder, the folder will become visible.  

Right-click on the drive or folder in which you have created the new folder and select Show all sub-folders.

Are you looking for the name of a folder?  You can use the Find>By Details (Metadata) . . .  dialog and search by Folder Name.  The result will display all photos in the folders that match your search criteria.  You can then right-click on a photo and choose Go to Folder to be taken to that folder in the Folder panel.