Hi Juergen,

Sorry for the waiting time.

We don't work on weekends so it adds two days to the waiting time.

We appreciate your patience.

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Can you please check do you have the "Fixed columns' enabled in the Advanced settings? If you have the Fixed Columns enabled, this will 'force' the Horizontal "scrollable" option on the Display settings.

2. When it comes to Custom Column Width, this is only possible if you have the "Limit table width" from the Display Settings.

As we mention on this Page :

If you enable Limit Table Width, the Scrollable slider will be hidden from view. 

The same logic applies in reverse fashion (if Scrollable is enabled, you won’t see Limit Table Width). Also, Word Wrap function appears, and can be enabled when Limit Table Width slider is enabled.

So to summarize, with the built-in options, you won't be able to have Fixed Columns combined with "Limit table width" option;

thus, if you don't have that option > then you won't see the Custom Width in the Column's display settings.

3. We only have this workaround, if you need to set custom column width combined with "Horizontal scrollable" option :

First enable "scrollable" in the Display tab, then you can add this custom CSS to the table's customize / Custom CSS tab :

.wpDataTablesWrapper table.scroll.wpDataTableID-1 {  
  width: max-content !important;    table-layout: fixed !important;
}
.wpDataTableID-1 th.column-strap {   
  width:300px !important;
}

You will have to replace the table ID with your table's ID,

and for the column name, you have to set the "origin header name" of the column, after this part : "th.column-"

For example, on my test table here,

if i wish to add the custom width in this CSS for the "firstname" column,

it would be 

.wpDataTableID-2671 th.column-firstname {
     width:300px !important;
}

Let me know if that helped.

Thank you