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Sorry if my source misled you into a seemingly obvious solution, but the names in a list should be separated by the and delimiter.

Also, read the biblatex package's manual for details on how to assign values ​​to date fields.

Please make sure that you structure a name list in the recommended manner so that biber can process it.

As a registered user, you have the permission to upload your image to the forum server. There's no need to use another provider to store your data.

If your request applies to all example environments, you can copy the relevant source code from the class file, paste it into the preamble and modify ...

Please remove the (two) obstacles that prevent your example from running without errors. It is also welcomed if you share your crossposts.

Have a look at the last optional argument of the \titleformat command in the titlesec package manual.

A full with marked code is more appreciated.

It is not enough to just load the longtable package. Please read the package manual.

In the attached pdf file it looks as if the table is too wide and extends beyond the right margin. In this case, you should have a look at the xltabular package and ...

Some notes regarding to the a4wide package:

• obsolete packages
• l2tabu

By the way, the \\ macro after the \bottomrule command can be omitted.

Please try to offer a complete minimal working example.

The values ​​of the table-number-alignment and group-digits options are the default settings.

Use the table-format option with a suitable assignment to solve the problem.

Check out the alignat environment in the amsmath user's guide.

I would like to point out that your wish could also be fulfilled if you assign a different name to the heading option. In the biblatex package manual, this would probably be bibintoc or subbibintoc.

Please share your crossposts.