You can perform two or more tasks on a single phone screen.
Activate Multi-Window Mode on Samsung Galaxy J7 Plus with the following instructions:
Step 1: Go to settings and select advanced features.

Access settings and choose advanced features.
Step 2: Select Multi-Window.

Choose Multi-Window.
Step 3: Activate Pop-up view gesture.

Turn on Pop-up view gesture.
Step 4: Multi-Window interface.

Multi-Window interface.
Your setup process is now complete. Best of luck to all of you.