I am on Ubuntu 18.04 LTS. As a unity user I am facing a big difference with gnome as notifications are showed up at the top center. It is annoying while dealing with specially browser tabs. I searched the Internet and found this, but it did not work as described. Can someone help me with this?
To install the Panel OSD extension (as suggested in the external link you've mentioned) properly first install the
chrome-gnome-shell by running
sudo apt install chrome-gnome-shell
Then go https://extensions.gnome.org/ using Firefox or Google Chrome. The webpage should ask you to install a browser add-on/extension, install it.
Then go to the extension's webpage. You'll find a toggle button. Turn it on.
Once the installation is finished, you'll be able to change the preferences of the extension using (GNOME) Tweaks.