A "Find in Data Dictionary" search utility (Ctrl+N) is available to locate text of objects within the active tab, with the ability to search for case sensitive text.
The entry box is also a drop down where the search history is available in the drop down items. To clear the history, press the [Ctrl+R] key combination. The search history is saved in the C:\Users\<User>\RBTI\ folder within the DATADICT.RST file.