brent Katoa I removed the installed program and installed it from Flatpack (I have Zoom installed from there and it works well). The version is installed on 21.09.20. The timeline is now displayed, and icons appeared above the timeline, everything seems to be working. But the "Open File" button and some menu items in the "Help" drop-down list do not work. Also the problem with scaling ... The interface is too huge.
I also observe a problem with connecting the module "canberra-gtk-module", although it is in the system.