Hay Anthony,
At the current time, Wix Tables allows you to select between equal width columns, at which time we divide the width of the table by the number of columns and use that as the width of each column.
You can also set the width of columns individually in the editor, and if the total width of the columns is greater then the width of the table itself you will have an horizontal scroll bar.
Two other alternatives that we do not have at this time (because they also create some anomalies) are to try and auto fit the columns width to the content. One variation is to try to fit it all to the table width, which in many cases causes content of cells to be clipped. Another alternative is to auto fit to the cell contents but not restrict to the table width, which in most cases will cause an horizontal scroll bar.
Do you think any of the two other alternatives can work in your case?