animator layer window broken in Unity2021.b5

background: I create and edit an animator, but today when i want to edit it, the animator window seems broken and nothing displayed in the layer window:

my condition:
Unity2021.b5
URP
windows10

I tried:
I tried to delete the library folder, and reopen it, but still broken.

Hello @shibi2017
Please file a bug report so that we can take a closer look at your issue and assist you.