when starting a video, Safari always expands it to full screen
When I go to a web page with a video and play it in Safari, the first time I play it, it plays with the default size in the window. If I pause it and then play it again, it always expands to full screen. If I hit ESC or click the appropriate spot to exit full screen, pause the video, and hit play again, it once again expands to full screen. This happens on all websites and does not happen in Chrome or Firefox. Anyone know how I can fix this? I have disabled all extensions, so it can't be one of those.
This is on Mojave with Safari 12.1.1, but it has been happening for many months. I finally cannot take it anymore.
Help! And thank you.
MacBook Pro with Touch Bar