Folder Thumpnail

[frankdarwin]

I have a folder for which a folder thumpnail is displayed in the properties. However, the icon of the folder is default.
I don't remember what I did to define the thumpnail in the properties. It was not my intention to assign a thumpnail to this folder.
How can I undo this in the properties.
In IMatch Help it is described that there is the possibility to assign a thumpnail to folders, but not how and also not how to undo it.

[Mario]

There is no need to remove it. If you delete the file used for the thumbnail, IMatch falls back to a default. You can also change it any time,
Unless you switch the Media & Folders to display folders thumbnails, you won't even see it. So don't bother.