First my device information
Android version: 8.1.0
Manufacturer of the device: Alco
Model of the apparatus: RCT6A03W13
When I started using the device, I was able to use the split screen mode. Now, from one minute to the next, it was no longer working. I've been trying to long press the button for the recent application but nothing is happening. When I go to the overview screen, I do not see this little button on every open application that would allow me to select it to set the split screen mode.
Here is a picture of my overview screen