Holding <kbd>Earth</kbd> allows to choose the language layout directly.
Holding the <kbd>Earth</kbd>icon allows to choose from selected language layouts in the settings, or from any available language layout directly (by tapping the second <kbd>Earth</kbd> icon in the popup).
<kbd>Shift</kbd> switches to the upper case layer.
<kbd>Shift</kbd> switches to the upper case layer. Please note that after typing the first capital letter, the keyboard will **not** turn off the <kbd>Shift</kbd>, so you need to do that manually.