Hi Ulrich, to give some answers:
Go to these link, please. All that you need it's build you own theme for Qlik sense.
- First, in a KPI chart the background color is white, how do we adjust this?
I didn't see any KPI Chart in Qliksense. I believe, You are asking related KPI Object. From that You can't change BG color for that as it is limitation with Native objects. I can suggest you to go Widgets / If you are talking about Extension, For that you need to work around in CSS files
- Second, how do I manually adjust line colouring? I can select a 12 or 100 color scheme, but I want to manually adjust because the colours that have been selected automatically are quite similar.
For that, You need to use Master Item or Measure expression for color
- Third, between charts we would like to have lines, as a sort of divider. Is that possible?
No, But For a while, You can make using ASCII Keywords for that.