What is the name of the Microsoft word feature that offers an optional display showing symbols indicating a tab space?
WordArt is an "optional extra" feature of Microsoft Office - it doesn't get installed by default. To install it, insert your original Office disk and follow the instructions for adding to the installation - you should find it under the Word options. The details depend on what version of Office you have.
What is the word for a software feature you use to look at a document in different ways or to display or hide software features on the screen?
The software feature is usually referred to as the "View Menu," and on many Microsoft Windows applications, the menu will actually be called "View," and will have a variety of options for controlling how the document is presented and what features are available, without altering the contents of the data.
AutoCorrect is an optional feature that you can turn on or off. If it is on, it will use a database of common misspellings of words to correct your spelling as you type, as soon as you indicate a word is complete by typing a space or punctuation mark. You can also add entries to the AutoCorrect database for new words, jargon words, and to expand abbreviations.