If you’re like me you have more than one document open at a time. Controlling that gets messy, and I’ve often wished that I could have a tabbed interface like my browser of choice. Thankfully you can. That’s because macOS Sierra introduced a tabbed interface that almost any application can use.
Tabs work almost exactly like they do in Safari. If you have several windows open you can use the Merge All Windows command under the Window menu, where Tab-specific menu items reside. Doing so will merge all open documents into a single window with multiple tabs. Command-T opens a new tab, as does clicking the “+” button. Dragging a tab rearranges the tabs, and dragging the tab off the tab bar moves the document into its own window.
We have verified this new Sierra specific feature works in both Nisus Writer Express and Pro. In fact, this should work on many apps, as this feature is system wide.
So if you want to reduce open window clutter, this new feature is for you.