safarisplitviewmac

2016年12月28日—FounditonApple'ssupportsite:Ifholdingdownthefull-screenbuttondoesn'tenterSplitView,gotoApplemenu>SystemPreferences,click ...,UseappsinSplitViewonMac·OnyourMac,movethepointertothegreenbuttoninthetop-leftcornerofthewindow,thenchooseTileWindowtoLeftofScreen ...,

參考資訊如下
Use Split View With Two Safari Windows

2016年12月28日 — Found it on Apple's support site: If holding down the full-screen button doesn't enter Split View, go to Apple menu > System Preferences, click ...

Use apps in Split View on Mac

Use apps in Split View on Mac · On your Mac, move the pointer to the green button in the top-left corner of the window, then choose Tile Window to Left of Screen ...

Use apps in Split View on Mac