How to fix this in Minecraft?

I have no idea what I did. But that's been the case since yesterday.

Thanks in advance!

Where is the problem? What is different?

Do you have mods installed?

Do you mean the textures? You can change it in the settings

Something more specific? Xd
You hide your hud by pressing f1
you change your fov in the settings
you change your version in the launcher
You can change your graphics settings in… Graphics settings
you can remove your effect with milk

You have to go to the quality submenu in the graphics settings and set Better Weed to Off.