Are you using Mastodon through a computer?
Do you wish there was a multi-column TweetDeck-style interface?
There is! It's called the "advanced web interface" and you can activate it any time you want. It lets you add many specialised columns, subscribe to hashtags and all kinds of stuff suited to large wide displays.
Log into the website, go to Preferences > Enable Advanced Web Interface, tick the box and click "Save Changes".
(To restore the default single column interface, do the same thing but untick the box instead.)
This used to be the default interface on Mastodon, and very old articles about the platform will have screenshots of the multicolumn interface.