i want to resize my default application size

i resize my application size but when i close my editor and reopen it went to default size please help me

Hey there @Naveenshakya121! Welcome to the community! The editor tends to retain the size/shape in which it was last closed unless resolution changes in the meantime, in which it will fallback to a smaller window. Are you running it from the editor exe directly or letting the launcher pull it up?