Power PDF offers two working Modes: Review Mode and Advanced Edit Mode. The latter allows freer editing of document content, it particular, its text. It offers a wide range of editing, reviewing and marking-up tools, similar to those found in word processor programs. See Advanced Edit Ribbons.
Documents with security protection against modifications cannot be sent to Advanced Edit Mode. Image-only PDF documents or pages enter the mode as images. In order to modify their text content, you should first make them searchable.
Enter Advanced Editor from the left of the Edit ribbon. Leave it by a similar tool at the right end of the ribbon.
When you switch from Review Mode to Advanced Edit Mode, the PDF document is analyzed and transformed. A message informs you of likely changes, for instance that tags and layers are removed. It also offers conversion settings.
You are advised to make a backup copy of the original PDF before entering Advanced Edit mode, since the conversion may occasionally encounter difficulties with text flow, formatting and character spacing. If advanced editing has not produced the desired results, you can close the document without saving it - allowing you to return to its previous PDF View state.
Alternatives to Advanced Editing are to use the Typewriter tool, or the Text Box tool on a PDF that you later flatten to force text box content to become part of the PDF. However, these tools allow only minor text changes, whereas Advanced Edit allows much greater changes.
When advanced edits are complete, you are advised to use the Finalize tool in the Home ribbon, because this makes the changes permanent and removes no longer needed flowing layout metadata from the document. This is desirable before the document is made available to others.
When you save, print or send the document from Advanced Edit mode, or you click on the PDF View tab, the document is returned to its state in PDF View, with changes intact.
To capitalize first words of sentences automatically
Go to File > Options > Document > Advanced Edit, and under AutoCorrect options enable the checkbox Capitalize first letter of sentences.