-Pressing enter after renaming the elements not working in UI Builder Hierarchy.
-Pressing the Escape(ESC) button is also not working to get out from the renamed state.

Steps to repro:
1. Create a new Project.
2. Window > UI Toolkit > UI Builder.
3. Library > Controls > Button.
4. Hierarchy > Double Click on Button > Rename > Enter.

Actual Result:
Nothing happens

Expected Result:
Button element should be renamed.

Reproducible in:
2021.1.0a10, 2020.2.0f1, 2020.2.0b11

Working Fine in:
2020.1.1f1

Note:
-Unable to test on 2020.2.b10 to 2020.2.0a1 due to errors on installing UI builder package.

Environment:
Occurring on Windows 10 & Mac 10.15.