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You're already grouping by start date, so just close the group for "Start any time" (and any other groups you wish minimized) and save a perspective, making sure the Restore: Expansion box is checked. Whenever you use that perspective, you'll be able to see the items starting today or recently without having a potentially lengthy list of items with no start dates to scroll past. If you keep on top of your workload so that you don't have groups for Started last week, last month, within the last 3 months, etc. this may be all you need.