Outlook's Immersive Reader view centers the text on the page and lets you use wider spacing between the letters, split words into syllables, change the page background color, or view the text one, three, or five lines at a time.
When the Immersive reader is enabled, it is on when reading or composing messages. When it’s turned on, most incoming messages will use the immersive reader (some HTML may not). Appointment, Task, and Contact's Notes field are affected when the Immersive reader is on.
The Immersive button on the right end of the Message tab (of an open message) will turn it on; turn it off by clicking the button again or clicking the Close button on the Immersive Reader tab. In the main Outlook window, turn the Immersive Reader on from the View tab, it’s on the far-right side of the ribbon.
While it can help you focus on the text, if it is turned on accidently and you don’t know what it is or how to turn it off, it’s more annoying than helpful.
I had several users who had no idea what they did to change the look of their email. The first user tried to explain it as dots between all of the words, which made me think formatting marked were turned on (Ctrl + Shift + 8 to toggle them off and on).
Unfortunately, that just added more dots between the words and he shared a screenshot, which “spoke 1000 words”. I saw the Immersive reader tab and the dots marked the syllables.
None of the users recall enabling the Immersive view, and none noticed the Immersive Reader tab that is visible (with blue text) when it’s enabled.
When you are using the Immersive Reader, you can control the column width, page background color, text spacing, and how many lines of text are shown. Use the mouse wheel or the arrow buttons onscreen to scroll. With the Syllables option enable, words are split into syllables.
Note that Line Focus doesn't work well to read HTML formatted email and doesn't work in plain text messages. It works fine when composing messages.
Immersive reader is available in Word, OneNote, Outlook, Teams, Edge, and more.