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Change how messages are displayed When using Slack on your desktop, you can adjust how your messages are displayed by choosing a theme and selecting additional display options if you like. 
Clean vs. compact theme 
 
By default, Slack uses the Clean  theme. If you’d like to see more messages at once, you can switch to the compact  theme instead.
 
Clean theme  The 
clean  theme displays member profile photos beside their messages.
 
 
Compact theme  The 
compact  theme uses less white space between messages and hides member profile photos.
 
 
 
Desktop
Mobile
Click your profile picture. 
Select  Preferences . 
Click  Messages & media  in the left sidebar.  
Choose either Clean  or Compact .  
 
You can adjust other message-related display settings under  Additional options : 
Display information about who is currently typing a message Show times with 24-hour clock 
Display colour swatches next to hexadecimal values 
 
 
It's not currently possible to change message display from the Slack mobile apps, but the app display will scale to match the font size that you set in your device settings.
 
 
Want to change your font size?  You can adjust your zoom level  in Slack to increase or decrease the size of your text. However, it's not possible to change the font.
Thanks a lot for your feedback!
If you’d like a member of our support team to respond to you, please send a message to feedback@slack.com .
If you’d like a member of our support team to respond to you, please send a message to feedback@slack.com .
If you’d like a member of our support team to respond to you, please send a message to feedback@slack.com .