resize window to 1:1 when rotated

I want to use OBS to capture my phone's screen, and in order to ensure the resolution quality, I press Ctrl+G to make it resize window to 1:1 (pixel-perfect), but the problem is that everytime I rotate my phone, I need to press Ctrl+G again to resize the window. Could you help me to make the window fixed to 1:1 once I press Ctrl+G, thanks.