I'm running most recent version of Thunderbird (Ver 78.1.1 build ID 20200805003102) on updated Windows10 (64 bit, x64 processor) in a home built computer in 2011 (RAM 16 GB). I utilize Thunderbird's filter system. Since last update, I'm unable to add names or edit individual filters. After opening a particular filter it appears as a single column extending beyond the desktop. I'm unable to change the window box. Any effort to manipulate a filters' entry freezes Tunderbird and eventually I must close it down with Task Manager.

Can anyone help me?