https://www.cnet.com/news/samsung-unveils-instagram-mode-for-galaxy-s10-camera/#:~:text=The Korean electronics giant on Wednesday announced Instagram,photo or video without leaving the camera app.
From that article
"We've worked together to rethink the Instagram experience on the S10," Instagram head Adam Mosseri said at Samsung's Unpacked event Wednesday in San Francisco. He added that Samsung's new phone will be "the best way to express yourself on Instagram."
To introduce the feature, Mosseri took a selfie on stage with DJ Koh, president of Samsung's mobile business.
"Instagram's mission is to bring you closer to the people and things you love, and we're always working on new ways for people to express themselves and connect with their friends," an Instagram spokeswoman said in a statement. "We look forward to seeing what people will share."
Instagram developers often add and remove some features. Just a month ago, they introduced new fonts https://fontsprokeyboard.com/how-to-chose-the-best-fonts-for-whatsapp, so possibly, they deactivated some old features in return. Anyway, I believe it is better to raise this question on the official forum. You will surely get an appropriate response and explanation.