Wow thanks for your fast reply.
Based on your code, It will work like this
The order of the two functions seems to be a problem.
Perfect without "a line border".
Code:
void main()
{
	level_load("");
	video_window(vector(0.1, 0.1, 0), vector(1366, 768,0), 1, NULL);
	video_set(1366, 768, 0, 2);
}