You have several options for that in the F/LOSS world: Linux containers, BSD jails, Qubes OS, or plain old VMs, etc. As with anything on these platforms you're

You have several options for that in the F/LOSS world: Linux containers, BSD jails, Qubes OS, or plain old VMs, etc. As with anything on these platforms you're free to pick your tool of choice. On Windows there are also a few options, Sandboxie being the best one IME. It's open source now as well, though the quality and stability have taken a hit. And there's Windows Sandbox, which has been shipping since Windows 10. I'm glad users can still make a choice on desktop OSs. As great as app isolation is on mobile devices, there's little from that ecosystem I would want on desktop. Even though OS manufacturers are desperately trying to merge the two...