Tap on the "burger icon" in the top left corner of the screen and go to "Settings". Select "Country filter" and tap on the countries you would like to add in order to have their card templates displayed in mobile-pocket. Selected countries are displayed below "selected".

In order to display card templates in mobile-pocket you have to pick at least one country. To remove a country from the list just tap on it a second time. Tap on the "check mark" in the top right corner to save your settings.