Hi, @M_SBS_6
There are a few reasons why the Analytics tab might not be available.
The ability to add trend lines from the Analytics pane depends on the type of visual you're using. For line charts that contain time data, trend lines should generally be available. However, if the visual isn't recognized as a time series, or if it's used in conjunction with other types of visuals that don't support trend lines, this could be a reason for unavailability.
Trend lines require a time-based x-axis to work properly. Make sure Power BI recognizes the Date, Year, Month axis as a date hierarchy.
Make sure you're using the version of Power BI Desktop that supports trend lines in the Analytics pane. Although this feature is widely supported, using an outdated version may limit your access to certain features.
For more information on creating trend lines and some other information, you can check out the links below:
How to add a Trend Line to Visuals in Power BI (popautomation.com)
How to Get Your Question Answered Quickly
Best Regards
Yongkang Hua
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