Excuse my inability to find it.

bedrockify-1.4.0+mc1.18.1

Warning: This solution is not tested, and if it was tested then this notice would be removed accordingly.

Solution

1. Locate you minecraft folder
2. Open config/bedrockifyMixins.json
3. Change "client.features.worldColorNoise":true to "client.features.worldColorNoise":false
   • You can use your file editor's Find/Replace feature if it exist.

Hi! that is a correct solution, another way is to open the bedrockIfy settings menu, go to the Mixins tab and search for the client.features.worldColorNoise and disable it