In a recent CS:GO update, Valve decided to force users to move to their new csgo UI and enabled Panorama by default for all users.
Now, even though we support panorama, if for whatever reason you want to use their old scaleform ui, you can easily do that with just a few clicks. If you then decide to go back to panorama, just delete the "-scaleform" text and it should go back to normal.
Please do not use this guide. It does not work anymore because Valve removed the scaleform UI altogether in the 8/29/2018 update.
Hope this is useful as we received many messages about panorama recently.
Don't hesitate to leave a comment below if you have other questions.