To disable the date column on your Zylpha generated index, first navigate to the index and pagination settings by clicking the "Index and Pagination" row on the bundle building page.
This will reveal a side panel on the right containing the index and pagination options. Expanding the Index Settings section will allow you to toggle the date column on and off.
If you've already generated your bundle before changing these settings, please regenerate your bundle again for the changes to take effect.