Object face smoothing group numbers are slightly cut from the left side under Smooth Group Editor window, refer attached screenshot

Steps to repro:
1. Create a new project.
2. Window > Package Manager > ProBuilder > Install
3. Create a new shape > Select Face Selection tool
4. ProBuilder window > Smooth Group Editor window > Object Smoothing group numbers

Actual Result:
Object face smoothing group numbers are slightly cut from the left side

Expected Result:
Object face smoothing group numbers should be visible clearly

Reproducible in:
2021.1.0a1, 2020.2.0b7, 2020.1.7f1, 2019.4.10f1, 2019.3.8f1 with package version 4.4.0, 4.3.1, 4.2.3

Working fine:
2019.3.7f1, 2018.4.27f1 with package version: 4.4.0, 4.2.3

Environment:
Windows10 and macOS 10.15