In older versions of Android it'll look like this (https://www.androidpolice.com/2017/07/14/gboard-6-4-brings-incognito-mode-marshmallow-nougat-small-changes-ap

In older versions of Android it'll look like this (https://www.androidpolice.com/2017/07/14/gboard-6-4-brings-incognito-mode-marshmallow-nougat-small-changes-apk-download/ https://www.androidpolice.com/2017/07/14/gboard-6-4-brings-i...), while newer versions of Android will have an icon on the top left of the keyboard, before the stickers, gif, clipboard, and cog buttons. This is with the default Google keyboard (gboard), your mileage may vary with other keyboards.