Description:
When inserting custom field (Insert, Field, More Fields..., window Fields, tab Variables), having Level >= 1, the Separator textbox has maximum zero width and therefore cannot be used. (It is not grayed out.) When trying to insert from clipboard it says "The inserted text exceeded the maximum length of this text field. The text was truncated.".

This seems only be true for the new/custom variables, for example, I created new  Number range (Type) called Requirement (Name, or Select), chose Level 1 in Numbering by Chapter, I cannot put anything into Separator.

If I choose already defined Number range Illustration, the Separator contains ".", has maximum width 1 and can be edited.

I would suggest to remove maximum width constraint for Separator completely and let the user decide what s/he wants.
Or, at least maximum width 1 should be used for new fields too.

Steps to Reproduce:
1. Create new Number range (Type) called Test (Name).
2. Choose Level 1 in Numbering by Chapter.
3. Try to put anything in Separator.

Actual Results:
You cannot put anything in Separator.

Expected Results:
You can put at least 1 character. Preferably, I would enforce no constraints and let the user decide how the separator should look like, e.g. letting her/him use "->".


Reproducible: Always


User Profile Reset: No



Additional Info:
[Information automatically included from LibreOffice]
Locale: en-US
Module: TextDocument
[Information guessed from browser]
OS: Linux (All)
OS is 64bit: yes

Version: 6.0.7.3
Build ID: 1:6.0.7-0ubuntu0.18.04.10
CPU threads: 8; OS: Linux 4.15; UI render: default; VCL: gtk3; 
Locale: en-US (en_US.UTF-8); Calc: group