Hello. An unknown problem was noticed(possibly a bug):when scanning a folder with a large number of malware (various), when the settings are set to delete, without automatic correction, and when the mode is enabled without notifications(because there are a lot of notifications), if you open the virus storage for viewing, the Avast interface immediately closes and the Avast icon in the tray disappears.This also applies to versions 20.6 and 20.7. if it is not difficult, check and (if so) report the problem to the developers.Windows10 2004 19041.450
Do you have any recent unpXXXXXX.mdmp files in C:\ProgramData\AVAST Software\Avast\log folder - with a timestamp that would correspond to the crash (disappearance)?
If so, could you upload them e.g. to ftp://ftp.avast.com/incoming and post the exact file name here?