Where is the property for changing the fill of the dropdown or datepicker background? I've tried Fill, BorderColor, etc and nothing changes the background of the icon.
There was a post by @SamVector with the same question the other day.https://powerusers.microsoft.com/t5/General-Discussion/Date-Chevron-Colour/m-p/104328#M38201According to @Breon, they will introduce a new property soon (IconBackground) to carry out this task
As @timl says, this is planned, but at the moment you can play with the themes, maybe one of them is more similar to the color what you want.
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Features releasing from October 2020 through March 2021