ZenFone 6 is generally a little towards a warmer temp as standard. If you don't see any change when changing color balance in splendid, then you have either night light activated or that splendid has an issue.
For splendid, go to apps & notifications -> see all xxx apps -> 3 dot menu in top right corner -> show system -> scroll down to splendid -> storage & cache -> clear storage
If this doesn't help, then I'm afraid you need to reset your device