Yes, it is possible to view the scorecard metrics of an experiment for a custom date range that starts after the experiment start date. This can be achieved by creating an Explore report with a specific date range. The report will filter the events and metrics to be within that range. However, the users included in the report will also encompass those exposed before the specified timeframe. This is designed to capture the downstream effects of the experiment treatment.
Here are the steps to do this:
1. Navigate to the Explore tab.
2. Fire off a custom query with your desired date range.
If you're having trouble selecting a date range that starts after the experiment start date, it might be a technical issue. Check your inputs and try again. If the issue persists, please flag it for assistance.