Based on this post I tweaked my display CSS to hide the volume control which is useless with the digital output:
Here’s what I added to the end of app-e831b7a181.css:
@media (min-width: 800px) and (max-width:800px) and (min-height: 480px) and (max-height: 480px)
{
/* hide scrollbar on playback screen */
div#contentWrapper.playback { overflow-y: hidden !important; }
/* hide multi-room */
multi-room-dock {
display:none;
}
/* wider scrollbars */
::-webkit-scrollbar{
width: 30px;
height: 30px;
}
.knobWrapper {
margin-bottom: 4px;
}
#playbackPanelWrapper #rightPanel {
display:none;
}
#trackInfo #trackDetails
{
text-align:center;
margin-left: -433px;
width:400px;
height: 200px;
overflow: visible;
}
#playbackPanelWrapper #leftPanel {
float: left;
width: 50%
}
#playbackPanelWrapper #centerPanel {
float: left;
width: 50%
}
#trackInfo {
position: relative;
float: left;
width: 100%;
min-height: 1px;
padding-left: 0px;
padding-right: 0px;
text-align: right;
margin-top: 28px;
line-height: 1.3;
margin-left: 25px;
}
#trackInfo img {
width: 100%;
margin: 0;
max-width: 380px;
max-height: 320px;
border: 0px;
margin-top: -200px;
object-fit:contain;
}
}