There is not currently an option to remove those columns from the main sheet list. That would require some direct editing of the plugin code at this point. Feel free to post this in the feature request section with more details on what you want, and it will be considered for a future option/setting. If it’s only a couple of sheets that are recurring, but others are not, then it’s not clear if you want start/end dates removed for everything (main list of all sheets) or just in certain very specific cases (much harder to test for).