Emulator Problem: Game Boy Advance Emulator Full Screen Problem.

I have this problem that I'm using a very wide PC Monitor with sizing 1360 by 738
pixels screen resolution.

Then I use the GBA Emulator and every time I use the Full Screen option, it will
stretches the length to fit the whole screen, ruined the original length size. Is there how
to Full Screen the GBA Emulator WITHOUT stretching the length? You know, the one
with blank black space at the sides? If not, then is there a good GBA Emulator had that
feature?

Thank you for reading.

Try using Visual Boy Advance. It has many Full Screen options aswell as an option to set your own resolution.