FIrefox - Android ერთობის განხილვა

I have a vivo pad 3, and when I'm using it in landscape mode, the firefox app would only occupy part of the screen, leaving the two sides empty. It used to work fine and I don't know what made it to behave like this since I didn't touch the settings, and no other app is like this.

Mozilla article says go to the three dot option and tap 'Synchronise and save data..' Afraid there's no sign of such an option.

Firefox on Android always opens on a private tab.

Thanks

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