With , you can customize how timelines are displayed in the app.
For that just open "Main menu > Manage timelines".
You will be able to reorder your timelines by moving items. Hide a timeline by tapping on the eye icon. All timelines can be removed excepted default ones that can only be hidden.
Also, by tapping on the "+" button at the top right, you will be able to follow remote instances (and also Twitter accounts through ).

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If you have a fediverse account, you can quote this note from your own instance. Search https://toot.fedilab.app/users/apps/statuses/115034965786540591 on your instance and quote it. (Note that quoting is not supported in Mastodon.)