Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Create a new Heatmap with Default Values (Assets > Create > Shader Graph > Custom Heatmap Values > Heatmap with Default Values) 
3. Enter "999999" number in the Subgraphs elements amount field
4. Observe the Editor

Actual results: The Editor freezes indefinitely

Expected results: The Editor does not freeze or there is a limit of elements since there is no need for that large amount of elements to be accepted, or some sort of validation

Reproducible with versions: 6000.0.61f1, 6000.2.10f1, 6000.3.0b8, 6000.4.0a3

Tested on (OS): MacOS Silicon Sequoia 15.6.1, Windows 11