If you regularly misspell certain words or sentences while typing in Google Docs, the automatic substitution feature allows you to train it to recognize those words and auto-correct them as you type. The classic example possibly typing “teh” instead of “the”. Google Docs helps you counter these habits with the automatic substitution feature allowing you to select a substitution in any Google Doc documents you create or edit. Here’s the steps to enable Automatic Substitution in Google Docs.
Step 1: Open a document in Google Docs.
Step 2: Go to File > Tools > Preferences settings.
Step 3: Check the box next to Automatic substitution.
Step 4: Add your own autocorrect options from here. You’ll see a blank row with two textboxes at the top, one for the word you want to replace and the second for what it will be replaced with. Type any misspelling of a word under the Replace field along with the correct spelling under the With field.
Note: You can disable any substitution you’ve added by uncheck the box next to the left of the Replace field or delete the substitute permanently by clicking the small X to the right of the With field.
Step 5: Once you’ve started filling in both the Replace and With sections, a new row will be added at the top for you to add more customized autocorrect options.
Step 6: Click the OK button to save changes.
[Bug reported]: The Preferences feature in Google Docs does not currently support uppercase letters. This is a known bug issue that the team is aware of, but don’t have any information at this time for when a fix will be made.