I use Molly but I’m sure its the same for Signal.
A recent update seems to use my wallpaper accent colour to drive the use a purple colour for the Dark Theme.
For some reason, to me, its really jarring.
While you can change the chat colours and wallpaper (although its more limited or you have to import your own). The purple still shows it many spots.
I’m pretty sure this is what changed unless I’m loosing my mind. I much preferred the old look by a mile.
@GlenRambo
This was a #molly specific change and not in the official signal. Molly did this change in the last release, I believe, and apparently is not a very popular change. There is a feature request in the molly repo to revert this change back to original dark theme. (github.com/mollyim/mollyim-android/issues/447)