Tokolozi , Jan 20, 2021 : try clearing it's cache (and maybe data) via settings and see if it opens then.
Cristiano1978 , via OnePlus 5 , Jan 31, 2021 : Go to settings> customization and change your theme to "Vibrant Tints" in the "present themes" option. All your data and lockbox contents will stay intact. Hope this helps, it helped me.
