Red x on blocks in minecraft?

Can anyone tell me how I can hide these red x on the blocks?

i play with bac

Try F7.

It does not work

F3? Try out all F's.

Do I have

The red X are from the Mod https://www.curseforge.com/...e-overlays. The default key for (de) activating is, as Jassy1603 already wrote you, F7, maybe you have changed the controls? A restart should also remove them.

These Xs show if a mob could spawn there. Just try pressing each key with F.

Mainkref