Notezilla associates a sticky note to a window using the title of the window. So Notezilla doesn't exactly know which app the note is associated with.
However, you can find the list of windows to which a sticky note is associated.
Go to the Notes Browser, from the Filters list select On windows filter.
You will see the below view. If you don't see an extra "Windows" column then follow the step #2 and #3 below.
2) Right click on any column header, then drag and drop Windows column from the column chooser and top it over existing column headers. Thanks.