Sometimes the balloon size is not automatically adjusted to the callout.
Solution
Here are some examples to modify the Ballon size:
1: directly by selecting the Ballon :
2: File - Preferences - Drafting Preferences
3: Customer Defaults - For later inherit
Hardware/Software Configuration
Platform: na
OS: n-a
OS Version: n-a
Product: NX
Application: DRAFTING
Version: V1984
Function: TABLES
Ref: 002-8565725