An idea by Community user @robert88 :
"I (ab)use dev-hub to edit my themes in QlikSense (Enterprise). It works perfectly as is, it just needs exposed in the UI. This allows me to rapidly iterate on CSS without relying on browser dev tool tweaking or tedious zip file uploads. Please expose it in the UI, and please don't "fix" my workaround haha.
To explain further, if you have the name of your custom theme and enter the URL <qlik-server>/dev-hub/extension-editor/#qext{<theme-name>}, you are able to edit the theme files directly.
Thanks"
Daniele - Principal Technical Support Engineer & SaaS Support Coordinator at Qlik
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