Some old themes like "default" or "coffee" uses old style background restricted to specific desktop sizes instead seamless border. It must be updated. Many software and ai tools can transform image to seamless (search like "create seamless texture").
Some old themes like "default" or "coffee" uses old style background restricted to specific desktop sizes instead seamless border. It must be updated. Many software and ai tools can transform image to seamless (search like "create seamless texture").
Example: