Yes, it's underneath the “More” drop down menu. You also have the ability to choose which Org, sandbox or scratch org that you want to validate/compare it to.
When using a deployment to commit any metadata directly to Git, I don’t see a button to validate like I usually do. Can I still validate before I commit to Git?
Showcasing how you still have the ability to validate, even when your committing to Git.
Written by Garrett Meeks