11.64.3 Can you answer these questions?

11.64.3.1 How to change the scrollbar color of the internal pdf viewer of TeXStudio?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751217

This question: How to change color of scrollbar? was answered and explained how to change the scrollbar color in the TeXStudio Editor. It works perfectly. 
On my machine, the thumb and track of the ... 
[color] [pdf] [texstudio]
 

asked by schoop https://tex.stackexchange.com/landing/r/digest?cta=user&id=415431 Score of 1

11.64.3.2 How can I adjust line spacing for the preamble in expex

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751470

Edit: @kabenyuk suggestion in the comments to use everyglpreamble = \setstretch{1} solved the first issue, see the image below. But the second issue persists. The space between 'b' and 'c' is greater ... 
[line-spacing] [linguistics] [expex]
                                                                                  

                                                                                  
 

asked by Cobalt https://tex.stackexchange.com/landing/r/digest?cta=user&id=415928 Score of 1

11.64.3.3 Cannot use a centered dot as active character

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751199

I wanted to have a better looking centered dot in words for gendered-neutral expressions in French, and the simplest solution that suited me was replacing it by $\cdot$: un$cdot$e dA~(c)velopeur$\cdot$se. 
... 
[french] [active-characters]
 

asked by Nowhere man https://tex.stackexchange.com/landing/r/digest?cta=user&id=6745 Score of 2