Go to the Shading workspace and select the texture you want to modify.
In the Properties Panel, navigate to the Texture Properties tab (the checkerboard icon).
Scroll down to the Image Sampling section.
Set the Interpolation method to Closest. This will help reduce the mipmap artifacts since it uses nearest neighbor sampling instead of bilinear or trilinear filtering.
If your texture is an image, ensure that the Use Mipmaps option is unchecked. This may not be directly available in all versions, but ensure that mipmaps are disabled in your texture settings.
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