Under the Mobile Alignment section of Global Styles, there are a few options (Fig 1). As the section's title implies, these formatting options only apply to users viewing the email campaign on mobile devices: 

• Center Text: Turns off the centering of body text. 
• Center Title: Turns off the centering of title text. 
• Center Button: Turns off the centering of buttons. 
• Center Image: Turns off the centering of images. 
• Center Social Icons: Turns off the centering of social media icons. 

Fig 1

By default, these settings are on. Turn them on or off by clicking their toggle. 

To learn more about the other sections within Global Options, read the corresponding article:

• Global Styles - General 
• Global Styles - Colors
• Global Styles- Typography
• Global Styles - Spacing