This issue is what I've been searching online for. Thank you for confirming it's not just me. The screen split is NOT working. It's very buggy and kicks 2/3 of the browser off the screen enitrely

Also, sadly, they couldn't fix the issue is MacOS Sequoia (updated to 15.1. It's the every same issue. Also, sidenote, someone over there fix the awful new iPhone photos app. Just... wawwhyy?