It's a feature of v17 (first available in v16R3), see this blog post for more details: https://blog.4d.com/merge-your-windows-into-tabs-on-mac-os-sierra/
The feature can be disabled in the 4D preferences under General->Options (see this image): https://blog.4d.com/wp-content/uploads/2016/12/Settings-768x651.png -Tim ********************************************************************** 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4d.com/archives.html Options: http://lists.4d.com/mailman/options/4d_tech Unsub: mailto:[email protected] **********************************************************************
