PCB design - copper not filling all the board

I recently design a PCB (DC to DC flyback converter) with an 36 V, 13 Amps input that is not filling up with copper around the main chip.Please let me know what is causing this and how can I solve this problem.

Can you post a screen shot? You have the ‘level’ required now.

The area must be physically connected to the plane that is filling. You get ‘islands’ when there is no connection.

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