Table cell properties/column width

Table cell properties/column width

I have created a table with 3 columns. I have set the column width of the first column to 50% using cell properties. The other two columns did not auto adjust to 25% each and I cannot set the width. It says 33% and no matter what I change it to, it will not change the width of the cells in columns 2 and 3 (and column 2 is much wider than column 3 but it needs to be the same width).

I don't understand why there is an option for Row Properties but not for Column Properties.

Kim