1. Generally, low-res texture blend with the content and the low-res set the resolution of blend. To find out:
   1. Run the project.
   2. Go to the Texture Out box.
   3. Select the boxes on after the other until the texture is in a good resolution.
   4. If the Content use the second pin of a box, like the Add or Multiply box, connect the content to the first input and the other texture to the first input.
      
      
2. Verify in the config is the Content and Backbuffer out has a good resolution. 
   1. Go to the menu Project—> Project Configuration.
   2. In the Canvas list, be sure the Content and Backbuffer resolution is high enough. By default, the resolution is Full HD.