目錄
Those arrow is to switch chart view from different perspective of different levels (Year, season, month, day, hour). Examples are as below.
1. Month
2. Season
3. Year

來源連結:
https://support.vitalyun.com/en/vital-crm/faq?view=article&id=5352:what-do-the-upper-and-lower-arrow-in-the-trend-of-customers-chart-represent&catid=28
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