I'm trying to add a trend line to the following graph and cannot find a way to do this. I have added trend lines to previous graphs without a problem and thought the solution was to turn the title for the Y axis off which makes the line style box appear, and then select the desired line style. That no longer works. I've watched several videos on the Power BI Community website for this but their solutions are based on older versions of Power BI. My version is dated May 2021 and the interface is much different than older versions.
I would appreciate any suggestions for how to turn the trendline property on.