Full-Text Search

Hi. I’m new to LibreOffice and I was wondering where I could find the Full-Text Search button (if there is one).
have a nice day

Menu/Edit/Search [Ctrl+F]
Menu/Edit/Search and replace [Ctrl+H]

Please take a quick read of the inner help and LibreOffice documentation https://wiki.documentfoundation.org/Documentation/Publications#User_Guides, it is very useful to know the basics and what are the capabilities of the program.