[Admin panel appearence]

currently using Revive Adserver v5.4.0 running on Apache, PHP 7.4.22 and MySQL 5.5.5-10.3.24-MariaDB

[Admin panel appearence]

Hello, I'm just beginning using AdServer and, after the installation I see a very poor interface, supposing isn't the correct one. Maybe it's due to some CSS lost.
Can someone please suggest me how to fix this?
See the image below.

Thanks in advance
Maurizio