Ctrl+E or Search > Incremental Search starts incremental searching. The floating icon appears, to indicate that the feature is active. The search begins at the cursor position.
As you type each character, the matching text is highlighted. If some text is already highlighted, it is included in the search string.
If you enter only lower case letters, the search is not case sensitive. If you enter an upper case letter, the search is case sensitive.
Ctrl+Shift+E or Search > Reverse Incremental Search starts searching up.
Escape or Enter ends the search.