Add a custom JS/CSS field to simplify UI customization
If you want to apply custom CSS currently, you need to use the Summon 2.0 External Script URL field in the Admin Consol, then call the CSS from that script. The files then need to be hosted somewhere. A better solution for us would be to incorporate a custom JS/CSS field in the Summon Admin Console to allow you to directly enter your script or CSS; or a file upload facility like the Springshare products (see attached screenshot from the LibGuides admin area). This would speed up our ability to fix issues and make usability changes.
Suzy Bailey commented
This sounds like it is possible by creating a hidden panel as per https://knowledge.exlibrisgroup.com/Summon/Knowledge_Articles/What_kinds_of_things_can_a_library_put_in_Summon_Custom_Panels%3F
Though not sure if it works on mobile...
Please also make changes active immediately or with just a small delay and not only after an overnight refresh of the system.