Simple as that you get the 'find' toolbar above the keyboard. Then tap the 'on this page option' (orange arrow).
In the search bar (red box) type the term you are searching for, in this case 'trolls'.Next, I have listed specific tips for Word, Excel, and PowerPoint. First, I’ve listed general tips that you can apply to all Microsoft Office applications. The following shortcuts and tips can be applied to most versions of Microsoft Office, up to and including Office 2016.
