Apple’s native web browser has lots of advantages. However, it is not entirely intuitive how to move a standalone window onto a window with multiple tabs in Safari. There is an easy solution though. It is all about dragging from the address bar.
Simple ways to bring Safari tabs together
I have been unable to move tabs from one window to the tab area of another window. When I try to do this (which should be a simple thing to do), what happens is the tab turns into a small page preview and will not become a tab in the destination window. If I let go of the tab after dragging it to the new window, it becomes a new page.
Maybe Apple changed something since you made this video but it can’t be done.
Great. A small summary as text description would be much useful!