By default, data tables can (and will be) long. A single record of data needs to be contained in a single row. Though a table’s width can adjust dynamically, it can only do so up to a point. If the viewport’s width cannot support the table’s specified width, the entire table will get truncated - along with its content.
We advise our users to switch from Table app to Cards app (using templates). This way, you can present all the relevant elements in a user-friendly layout and still display beautifully on smaller devices (like smartphones).