WhatsApp has an interesting function that allows you to archive any chat for later reference, be it an individual conversation or a group chat. To archive it, all you have to do is, in the chat tab, hover over it and slide the chat to the left, so that the menu opens and the icon that allows you to archive it is displayed.
How to access archived WhatsApp chats is not intuitive at all
It may also be that, inadvertently – it happens to me often – when you go to delete a chat, especially a group created for a certain occasion that you are not going to use anymore, you give the file icon. So all that conversation is saved and what you wanted was to erase it … how to go to the archived items to erase them? The process is not as intuitive as it should be.
If you want to access an archived chat because you want to read it again (or as in my case, you want to delete it permanently) the first thing you have to do is click on the "Chats" tab that is located at the bottom of the screen in the iOS WhatsApp app, which is identified by the drawing of a bubble or a chat "speech bubble". On Android, just look for the "Chats" tab in the top navigation menu.
Once there you will see all the chats you have active. You just have to slide the screen down with your finger, trying not to enter any chat, so that the option "Archived Chats" appears at the top of the screen.
It is a simple movement, but nothing intuitive, nothing suggests that the archived chats are hidden "there". By clicking on "Archived Chats" the list of all the conversations that have been saved will appear. If you haven't been in a long time, you may run into conversations you didn't even know were there.
Once in this section, you just have to click on the chat that you want to retrieve to see the conversation, or click Edit / Delete to delete it permanently. You can also put your finger on one of the chats and slide it to the left to save it again in the inbox, with all the other chats open.