I take no credit for this at all, but I managed to get the pf3 webdisplay icon (custom panel) to show in MSFS using the information in the link below and a small edit to the layout.json file using notepad.
https://github.com/bymaximus/msfs2020-t ... /issues/19
Add to layout.json
{
"path": "html_ui/icons/toolbar/ICON_TOOLBAR_MAXIMUS_CUSTOM_PANEL.svg",
"size": 702,
"date": 132401952992678246
},
I backed up what I had originally, just in case.
All the best
Ju