OnePlus has released OxygenOS Open Beta 3 for the OnePlus 6 and 6T, which bumps up the Android security patch level on the smartphones to November 2019. OnePlus 6T The new build also comes with general bug fixes and brings back the notch area hiding option, which is tucked inside the Settings > Display > Notch display menu. However, users aren't happy with it since the whole bar has been moved down. Here's the full changelog of OxygenOS Open Beta 3: System Added the notch area display options under Settings > Display > Notch display > Hide the notch area ...
Source: https://www.gsmarena.com/oneplus_6_6t_oxygenos_open_beta_3-news-40624.php
