It only works with Firefox and not with Edge and Chrome - very strange.
The mouse wheel works for me in Firefox, Google Chrome and
Vivaldi browser (OS is Linux) on your NovaSDR server.
 I just tried the 1 and 9 kHz mouse wheel on your NovaSDR server, everything works.

The secret is that you have to reload the page with CTRL F5,
click on the tiny gear in the upper right corner of NovaSDR,
select the desired wheel step and it works on that browser. 

When you come with another browser, again CTRL F5 to reload the page,
click on the gear in the upper right corner of NovaSDR,
change the desired mouse step....it will be remembered until
you delete the browsing history in the browser.

Now, what is the secret of setting the background image in NovaSDR,
share with us, please.

Best regards,
Darko, 9a7aof

Hi All
Yes, the mouse wheel works now in my Firefox, Chrome and Edge if I set the Mouse Wheel Step first in the settings and reload the website with CTRL-F5 :-)

a.) Rename your favorite background picture into background.jpg
b.) copy the background.jpg to /opt/NovaSDR/frontend/src/assets/background.jpg
c.) copy the background.jpg to /opt/NovaSDR/frontend/dist/assets/background.jpg

73 de HB9RYZ
Wolfgang

Thanks Wolfgang

for solving the background image problem (together we know more => teamwork).

Please, when you stop the server at your place, go into the NovaSDR directory
and delete (or rename) the chat-history.
After starting NovaSDR, please re-enter the chat instructions on
how to activate the mouse wheel.

It's awkward to look for that gear in the top right corner,
if that menu wasn't hidden, NovaSDR would have provided a
much better user experience.

I also don't like having to scroll up and down to
change the band I want to listen to.

73!
Darko, 9a7aof

Hi Darko
But I saw this morning, that the markers from markers.json in the NovaSDR folder are not displayed anymore - I don't know why

I deleted the file chat_history.json and after a restart, the history ist still there !
OK, I deleted the the file chat_history.json in the /frontend folder and it works now :-)

73 Wolfgang