one sec intervention opens in split-screen / multi-window

Some users have reported that one sec opens in split screen next to the target app which completely defeats the purpose of the intervention.

I have been in touch with Samsung to investigate how to fix this issue:

Please make sure that the "Multi Window for all apps" option is not turned on for the device: Settings → Advanced features → Labs → Multi Window for all apps 

If the option is turned on, all apps can run in multi-windows even for apps that opt-out of split-screen.

I have submitted feedback to Samsung to allow users to select specific apps to opt-out of this behavior. If you’re part of the Samsung Lab program, please consider sending them feedback regarding this issue as well.