Sometimes, a user inadvertently changes the font size in a MacOS Safari browser window, e.g. in Outlook 365 for Web. Font sizes in a browser window can be configured by keyboard.
Step-by-Step
Change the font size - You can increase or decrease just the font size of pages that you view in Safari. Safari will remember your settings until you clear your History.
- To increase the font size, press Option-Command-Plus sign (+)
- To decrease the font size, press Option-Command-Minus sign (-)
- Or you can go to the View menu and hold down the Option key while you select Make Text Bigger or Make Text Smaller.
Change the zoom level - You can increase or decrease the zoom level—both text and images—of pages that you view in Safari. Safari will remember your settings until you clear your History.
- To increase the zoom level, press Command-Plus sign (+)
- To decrease the zoom level, press Command-Minus sign (-)
- Or go to the View menu and select Zoom in or Zoom out.