Fortrikka screen-recording-2021-11-07-at-101525-hd-1080p-hd-720p.mov2MB As you can see, there is no sizeup animation for when you click the start page's address bar.
Fortrikka Vlad Here is a video. It simply shows without any sizeup animation. While the animation is of less initial size than the other buttons, in Safari it nevertheless still starts with a size around 85% smaller than its maximum size at the end.
Fortrikka If you look closely at the first second of the video, you will see that the popup underneath the address bar when you click it with the mouse very slightly scales down as you close it, while Orion's size stays exactly consistent.
Fortrikka The behavior is similar to the animations which the website preferences windows create as well as the privacy button.
Fortrikka Vlad The miniature start page slightly increases in size in Safari if you watch in slow motion. Orion's simply appears without any animation.
Vlad Fortrikka I still do not see the difference, I understand if you do. Waiting for more upvotes here.