After installing Big Sur I had a first look on how Mail Archiver works. Almost everything is fine.
There are only a couple of visual glitches.
- In the main window the delete icon in the toolbar is smaller than the other icons. There is a small gap between the toolbar and the rest of the window.
- The Pro Admin version has a couple of black in black listbox headers:
- What looks very strange is the toolbar in the Preferences. The selected item it hard to see. I opened a bug report with Apple. But they only employ children with perfect eyesight. If necessary I can change the icon of the selected toolbar item.