The Search box is located on the title bar at the top of the window. It enables you to quickly initiate a conversion with AI Assistant, or search commands, text, or online help based on the keywords you specified.
The Search box is expanded by default. You can collapse the Search box to make the interface cleaner, if necessary. To collapse the Search box, please go to File > Preferences > General, and check Collapse the Search box by default in the Basic Tools group. Once collapsed, the Search box will appear as a Search icon 
at the top right corner of the application window. Clicking the Search icon 
will expand the Search box for you to perform further operations. When you select an option from the Search box or click anywhere outside the Search box, the Search box will automatically collapse and show as a Search icon.