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The desktop version of Mastodon has two different interfaces: a single column Twitter-style one, and a multicolumn Tweetdeck-style one.
✅ To switch between Mastodon's desktop interfaces, go to Preferences > Appearance > Enable Advanced Web Interface. Selecting it activates multicolumn, unselecting it activates single column.
Multicolumn lets you add lots of additional columns, which may be handy for desktops on very wide monitors.
I also had to look twice
@feditips I was so confused at the layout of this but then I've realized that they're 2 separate images