Hello, in the QGO video recording page, you can choose the one of the resolution I propose in the capture format section. The 16:9 format crop the image and this is normal. For 1:1 is a square, this is not 4:3. Not possible to enter custom format atm as I already propose common formats such as 1:1, 16:9, 9:16, 2:1.
But if I misunderstood, please provide me screenshots ;-)
To update the app, you just have to click the update button when it is showed. The last one is v9.5.3, but a v10 is coming soon ;)