Yes, it is. It's an online exam.
Please refer this existing discussion for more details -- > https://communities.vmware.com/t5/VCP-VMware-Certified/VCP6-5-DCV-Foundation-Test-Open-Book/td-p/142...
There’s no such thing as “VCA Foundation”, can you be explicit as to which exam you mean please?
Every VMware exam is defined as “proctored” or “non-proctored” - the “non-proctored” exams can be done from anywhere in any conditions.
The answer is here, it states “non-proctored”: https://www.vmware.com/education-services/certification/vsphere-6-7-foundation-exam.html