Hi. Went there myself. Used CoinOps Arcadia Vertical 4:3 and had this same issue.
On CoinOps frontend, decide if you're going to use 90 degrees or 270 degrees instead.
On Windows 10, leave as it is. Considering you will have it as a dedicated Pc for Vertical titles,
just decide CoinOps to boot on startup and wait a few seconds.
Other than that, shelling could also work. but on changing Win10 to vertical settings simply will mess everything up.
BTW, I've edited this build to my likings. Added features the creators of CoinOps said it would be impossible in old releases,
such as info database like year of release, dev/manufacturer, number of players and so on.