right click the games exe in the files library. you can find these by right clicking the game in steam library then properties and local files. so in the properties of the exe try disableing full screen optimization i remeber haveing a similir bug as you. also there is a mod called age of reckoning that might or might not automatically launch better so try that too. if none of this helps tell me ill see if i can come up with some more solutions

found a better guide
https://node2.projectplanet.cn/@steamcommunity.com/sharedfiles/filedetails/?id=909946411

None of it all working, Yikes.
I'll try a re-install, and put on of Redemption again. And if it fails, too bad, no more Redemption for me.