Reproduction steps:
1. Create a new project
2. Create UI Document (Create > UI Toolkit > UI Document) and double-click on it to open UI Builder
3. Drag any Element to UI Builder Hierarchy
4. Select newly created element and open Text section in the Inspector
5. Enable Auto Size in Advanced Text Settings section
6. Select “initial” dropdown option in Min or Max Auto Size fields and observe

Actual result: “px” is displayed in Min or Max fields
Expected result: “initial” is displayed in Min or Max fields

Reproducible with: 6000.0.66f1, 6000.4.0b5
Not reproducible with: 6000.3.5f1, 6000.4.0b4, 6000.5.0a5

Reproduced on: Ubuntu 22.04, macOS Sequoia 26.2 (M4)

Note:

• “initial” can be set in other fields
• Field needs to be set several times for “initial” value to be set and it doesn’t set at all in Vertical Shadow Offset in 6000.0.66f1 version