Despite all that's happened to Twitter in the past few months, the legacy TweetDeck we all love is still available - and installable(!) - with a few steps.
- Visit https://tweetdeck.twitter.com and sign in.
- Click or tap the
... Morebutton in the left sidebar.
- Click or tap "Leave TweetDeck Preview."
- Follow the steps to either temporarily or "permanently" opt out of "the new TweetDeck."
Once you've successfully navigated to legacy TweetDeck, select the Share button and scroll to tap "Add to Home Screen."