There's a wide range of ages when it comes to the Roblox generation and I speak from experience as a librarian having to shush both kids and teens for being too loud on the computers while playing.
You can use Samsung's One UI to do split-screen multitasking on a Samsung Galaxy S10. Here's how to use it to display two apps side by side at once.
You can go split-screen on your Chromebook to divide the screen into two windows. Here's how to do it.