You can tell Tackle how far back you want it to sync with your Google Calendar. Depending on your account plan, you can choose between six months and three years. If you choose a longer period than your current plan allows, Tackle will automatically upgrade your plan.
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Firstly, visit the “Settings” menu from the top left corner.

Now, find the “Date Range” section here.

Once you've set your data range, you'll be able to see your calendar information in the Daily Agenda, Insights, Meeting Health, and Timesheet pages for that time period.