Multitasking on Android

Is there any way to enable the multi-tasking on the VNC Viewer for Android? I'm connecting to a vnc server hosted by my device in Termux but if I do not come back then Termux gets killed then restarts so if I could have both windows at the time it would be very useful. I would not have to restart the server and the workstation every time I leave the window unused for more than 5 minutes.