Yes, I fixed the problem with the avast bank mode extension. This extension is hidden.
How to fix the problem: Start avast secure browser-> choose extensions by clicking on the 3 small vertical dots-> On the extensions page activate developer mode at the top right, the hidden extensions will appear-> deactivate the "avast extension bank mode "-> close avast secure browser and restart it. The "avast bank mode" extension will automatically reactivate and in the security and confidentiality center bank mode is back.
edit: If bank mode has not returned to the security center, restart the computer and launch avast secure browser.
I believe that the bank mode disappears when using privacy cleaner. In privacy cleaner I have "all data" and all the options checked except the last one in the advanced mode.