Description:
Opening and selecting FONT FEATURES (character/font options) causes a default to be applied for FRACTION STYLE of DIAGONAL FRACTIONS - there's no option to de-select, and can only be removed (assuming 'cancel' not selected) by editing the font setting in the parent panel. 
NB: whilst found on Windows, issue is likely to be present on all platforms.

Steps to Reproduce:
1. Open Character style/font properties. 
2. Click Features - :frac=1 set by default.
3. Click OK


Actual Results:
Character/Font selection (assuming Times New Roman as selected font) now shows
Times New Roman:frac=1

Expected Results:
Times New Roman (no :frac=1)


Reproducible: Always


User Profile Reset: No



Additional Info:
[Information automatically included from LibreOffice]
Locale: en-GB
Module: TextDocument

Version: 6.4.4.2 (x64)
Build ID: 3d775be2011f3886db32dfd395a6a6d1ca2630ff
CPU threads: 8; OS: Windows 10.0 Build 19041; UI render: default; VCL: win; 
Locale: en-GB (en_GB); UI-Language: en-GB
Calc: threaded