Tables on websites can not always adjust to the available space on the screen automatically, so that they can extend beyond the screen edge on small screens. The previously available TablePress Responsive Tables Extension that offered approaches to deal with this, has been retired. It can no longer be downloaded.
As an alternative, you can use the Responsive Tables feature module that is available in TablePress Premium plans. It offers even more features and comes with a great user interface to choose a mode for responsiveness.
Without the Responsive Tables feature module, you can only use “Horizontal Scrolling” to make tables responsive, by activating the “Horizontal Scrolling” checkbox in the “Table Features for Site Visitors” section on the “Edit” screen of your tables.