Videos not Synced to TAB
When your video is playing you can just hover over it, and a control bar at the bottom will appear. On the right side of that bar, you should see a white rectangular icon that you can select to transform your video into full-screen mode.
To exit full-screen mode you can click the same button again or just tap the escape button on your keyboard.
Videos Synced to TAB
Wondering about the PiP (picture in picture) button?
If you see a video and can only find the PiP option, the fullscreen option can be found in the TAB settings menu.
Click the three dots (...) on the TAB settings bar
Click "Toggle fullscreen"
