Thanks. I did go into the .php file and severely changed the parameters as shown below, however, without the desired (or expected) effect.
Both images below show cause and effect.
You will see that I went one step further and coded the Event_name column to try and get past the issue Audra is (as well as I) experiencing.
Sorry to say, it also did not result in a change. There must be another reference to these columns in another file?
Trying to upload images....attached zip with images
I found that if I remove the Search field on the Event list, the column widths can be controlled as the solution that was offered maintains.
In dtregister.php, I went to line 2215 and removed the entire code for DT_SEARCH, which is one line. Everything fell into place.
(If you need your folks to search for an event, however, this is not going to help you. If you don\'t, then you should be able to control the column widths as you wish.)