During the early days of Twitter, the company would display tweets based on chronological order, with the latest tweets being at the top. However in recent years, they adopted a relevancy timeline which displayed tweets they thought you might be interested in, and tweets that were trending. However it was just last month that the company announced that they would be bringing back the chronological timeline as an option.
However accessing the option wasn’t so obvious, but Twitter’s latest announcement is hoping to change that as they are testing ways for users to switch between the different timelines more easily. This means that in the event you want to see the latest tweets first, you can do so, but if you wanted to swap to a timeline that displays the hottest/most relevant tweets, you can do so at a flick of a switch.
Unfortunately Twitter says that this is in the testing phase at the moment and only available to a small number of iOS users, so if this was something you were interested in, you might have to wait before the option is made available to you.