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It is not possible to select a bend line in a Flat Pattern to modify the line
font using Edit --> Object Display.
Solution
In Sheetmetal, change the fonts in the Preferences --> Sheet Metal --> Flat
Pattern Display tab. Then, update the draft view in Drafting.
Notes and References
Hardware/Software Configuration
Platform: na
OS: n/a
OS Version: n/a
Product: NX
Application: NX_SHEET_METAL
Version: V1847
Function: FLAT_PATTERN
Ref: 001-7859487