By default or if you hit cancel in the search field the Kanji of the current Set are displayed. If you search (by Kanji/Reading or meaning), the app searches within all Kanji of the program’s dictionary.
There are two search modes:
Contains: the default mode if you only insert the search term. It searches for all items that contain the search term
e.g. fire -> returns „fire door“, „accidental fire“…
Exact: if you put an ” in front of the search term
e.g. “fire -> only returns items which meaning is „fire“

clip white switch beween:
Marking mode: if you click on a Kanji it gets marked for your custom selection (Settings -> Test Set -> Marked Entries)
Detail mode: if you click on a Kanji, details of this Kanji are shown in the Practice View