okay to start off this hasn't happened before the 4/7/2020 update everything was normal. i can free manually change the graphics to any settings i want. 
since after the update last night, the game auto changes the grapahics to its highest quality. its kinda bugging me and i have to keep going to the settings to change it again only to find later that the game changes it back to high quality. 
im using galaxy s9.

any tips on solving this issue ? 
thanks. 

Yea, the same.
I not always prefer hi-res, also like soft blur with little pixelarity, especially in colorful locations.
In guild battles like min. effects, but not when app is trying to.
Most important - view distance. While node wars I would prefer raw polygons, then not to see battle in front of me.

Auto-optimalization is wrong.

**UPDATE**

I don't know if it's a fix but i reinstalled the game. So far i haven't had issues with the game auto changing the graphics to high quality.
Hope this helps.