[ubuntu] Autohide

My host is 18.04.3 and my guest is Centos 7. In my guest I'm using Gnome-classic that is the same option that I have in my host that is gnome-flashback. While in my host I can set the top and bottom panel to "autohide" by alt->right_click on the panels and get to the "properties" I can not do the same on the guest. Is there any way to achieve in the guest the autohide feature for the panels?

Thanks