Translations:Mastodon features explained/123/en

You can switch to the advanced interface in the appearance settings.
The advanced interface display more than one column at once. By default it displays the home timeline and the notifications, but you can "pin" the local & federated timeline, the profile directory, direct messages, bookmarks, favorites and lists too.
When you search for a hashtag you can pin that too and then select whether you want to display additional hastags in that timeline and switch between all toots with those hashtags or just local toots.