A new OxygenOS beta was just released for the OnePlus 5 and OnePlus 5T smartphones. Arriving as Open Beta 9 for the former and Open Beta 7 for the latter, the update brings a handful of changes, related to Launcher and File Manager. The update includes the double-tap to lock screen feature. It also features improved searched history for App drawer. Now coming to the File Manager-related change, the scanning logic for large files has been optimized. Head to the Source link below to access the official announcement as well as other beta builds related instructions. Source
Source: https://www.gsmarena.com/new_oneplus_5_5t_oxygenos_beta_build_brings_doubletap_to_lock_feature-news-30723.php