12.10.3 Can you answer these questions?

12.10.3.1 Biblatex, numeric-comp, sub bibliographies with labelprefix

https://tex.stackexchange.com/landing/r/digest?cta=question&id=759485

I want to split a bibliography depending on the entry type (journal & in proceedings for instance). In each bibliography, I add a labelprefix and each bibliography should be sorted. All this I can ... 
[biblatex]
 

asked by Bruno https://tex.stackexchange.com/landing/r/digest?cta=user&id=7269 Score of 1

12.10.3.2 Weird looking and not centered circumflex in euler-math

https://tex.stackexchange.com/landing/r/digest?cta=question&id=759530

I have two issues with the circumflex (hat{}) in the euler-math package/font. 
The first one is that for certain letters it seems to be not centered. 
\documentclass{article} 
\usepackage{euler-math} 
\... 
[unicode-math] [accents] [euler]
 

asked by M0M0 https://tex.stackexchange.com/landing/r/digest?cta=user&id=228576 Score of 3

12.10.3.3 How do I fix unwanted blank spaces and stretched paragraph spacing when using tcolorbox inside a 9-column multicols environment?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=759449

When using tcolorbox within multicols, it prematurely breaks columns, resulting in unexpected large blank spaces (as shown in the image), and the paragraph spacing between body text becomes ... 
[tcolorbox] [multicol]
 

asked by hjmonbld https://tex.stackexchange.com/landing/r/digest?cta=user&id=433672 Score of 2