Is there the ability to increase the size of the visible text area for tables?

If you are referring to the inputs in the matrix widget, you can modify the size by injecting custom CSS.

Use the following snippet (adjust the values to match your preferences)

.form-matrix-values > .form-textbox {
    width:100px;
    height:35px;
    padding:5px;
}

Insert it using the CSS tab under Designer tool

If this does not address the table you are referring to kindly let us know and we will advise accordingly.