The webmail interface has 3 possible skins. The default for new accounts is Elastic, but there’s a chance you are using Classic due to the age of your account.
You can easily switch back and forth between skins but we recommend sticking with Elastic as it will be the one best supported. The other skins should be considered deprecated.
Changing from Elastic skin
Log in to the RoundCube webmail client.
Click Settings on left sidebar.
Click Preferences from top of Settings list.
Click User Interface from top of Preferences sublist.
Select skin you wish to use.
Click Save.
Changing from Classic skin
Log in to the RoundCube webmail client.
Click Settings on top right of window.
Click User Interface from left sidebar under Section.
Select skin you wish to use.
Click Save.