The left top dash lines are the RenderRegion border… you can disable it with Ctrl+Alt+B, or in the View menu > View Regions.
The rest in the center… you better look into the Outliner to see how many objects you have there, and delete whatever you don’t need.
Thank you a lot man, Just solved the issues. I am trying the Blender Gurus Donut tutorial.
Thanks man, Solved the issue