How to hide top bar in Ubuntu 18.04?

First open the terminal and install chrome-gnome-shell package:

sudo apt install chrome-gnome-shell

Then install one of these extensions:

Finally, head over to the GNOME Extensions page for the "Hide Top Bar" extension and enable the ON/OFF switch for the extension to install.

For reference, install gnome-tweaks and run:

sudo apt install gnome-shell-extension-autohidetopbar

Then log out and back in. The option to auto hide the top bar will be available from gnome-tweaks tool in the extensions section.

The simplest and working way I found is to install the Dash-to-Panel GNOME extension. Works like a charm.

Dash to Panel Extension

You can toggle it from the browser itself.

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