Since SU2 Beta, all custom HTML toolbar menus have been rendering by default with incorrect dimensions (eg. very small font and deformed UI), as pictured here
If any of the margins are dragged, the UI will reset back to normal
Hello @vantech
Likely a duplicate of In-game panels do not appear on the screen or there are issues with the windows - [MSFS 2024] Bug Reports / HTML/JS - MSFS DevSupport
This should be fixed in the final version of SU2.
Regards,
Sylvain