Opening multiple tabs in the same window

[ferophila]

2.1.50 issue: new window instead of tab

The Qt 6 toolkit no longer supports the tab view, which has always been exclusive to Mac, by the way. The Qt 5 build should still support tabs, but you can’t install that on an M1 system. Unfortunately, there’s not much Anki can do about it other than wait for Qt to implement that again.