1. Opening your PDF file in the program>click Tool > OCR button.
2. Then you can choose either Searchable Text Image or Editable Text mode, click the Change Language button to choose the correct language of your PDF content to perform.
3. If you just want to select/search/copy text instead of editing text, then it is suggested that you can use the Searchable Text Image mode to perform OCR. In this way, the newly created PDF file after performing OCR can keep the same layout as your original content, and the text will be searchable and selectable.