The Search Pane is shown below.
The Search Pane is used to search the text of a message.
Opening
–Menu Bar > Edit > Find.
–Hotkeys: Ctrl+F or Cmd+F.
Elements
–Find in page field: enter the text to search for.
–^ and ⌄ buttons : find the previous or next occurrence of a phrase in the text.
–Highlight All checkbox: enable highlighting of all found occurrences.
–Match Case checkbox: enable case sensitive search.
–Match Diacritics checkbox: enable diacritical marks to be taken into account when searching.
–Whole Words checkbox: enable the search mode for whole words only.
–Replace button: open the Find and Replace window.
Find and Replace window
The Find and Replace window is used for searching and replacing text fragments.
Opening
–Menu > Edit > Find and Replace.
–Hotkeys: Ctrl+H or Cmd+H.