Unfortunately, you can't install opera stable, beta and developer at the same time from the repos.
I had to install opera stable 98 from flatpak, beta 98 and developer 100 from the repos, but now I can't upgrade to beta 99 (manually, not in the repos yet) because of conflicting files (see https://forums.opera.com/topic/62356/opera-99-beta/3?_=1684003600733 for details).
While both Opera GX and Opera One are closed, in both "C:\Users\yourusername\AppData\Roaming\Opera Software" and "C:\Users\yourusername\AppData\Local\Opera Software", delete the "Opera Developer" folder. Then, make a copy of the "Opera GX Stable" folder and rename the copy to "Opera Developer". Then, start Opera One.
@thatoneunoriginal Update: It appears it happens only on my main (laptop) monitor which is why it looked like it only happened when moving it from one monitor to another. (IDK if I can (or how to) edit the title to reflect this so yeh)
@d3m1tha Ok. Using the directions from https://forums.opera.com/post/308385, the custom URL you use in the New Tab Start Page extension to load the Speed Dial 2 page is chrome-extension://jpfpebmajhhopeonhlcgidhclcccjcik/override.html.