No try again, unless there has been an update to the old "Set_Orientation" which I haven't found, that app only works on devices Android 9 and below, New Chromecast has Android 10 which makes app non-functional.

Having the same issue tried set orientation and rotation manager already. Is there any other app which will support it?

I have a Google Chromecast.  I’ve tried a number of apps, but none seem to work on the most recent version.  Thanks!

Does anyone know a working app for forcing landscape mode on Chromecast for sideloaded apps?