To disable Vanish Mode on all chats follow these steps:
-Open Instagram.
-Open each Chat.
-Swipe up from the screen bottom.
-Hold the chats, you will see a msg “Release to turn off vanish”
-Now you can leave the chats.
-Now vanish mode is turned off.
The black background will turn back to normal. Tell your contacts on Instagram to switch off from Vanish Mode when needed. When you complete this step every conversation will return to normal text chat.
More information:
https://radarro.com/how-to-turn-off-vanish-mode-on-instagram/
