Opening another score in 4.4 opens another whole musescore session rather than just a tab

I'm used to older versions of musescore (3 and earlier), and in those if I open several files at once then they just appear as different tabs in the same session with just 1 musescore icon in my dock . Now that I have finally updated to the new version 4.4 then even if I open an existing file when I'm already in musescore it creates another icon in my dock rather than just having a tab. Same if I open multiple files at once. It makes it really tricky to navigate between them. Is there a way around this?