I have Jenkins setup running for a couple of months, with default admin user, several pipelines configured.
Now I have Azure Active Directory as security realm, and
Azure Active Directory Matrix-based security, login/logout works fine.
I created new empty pipeline, and UI is broken, I can't save changes at all.
I reverted back to jenkins user database, and admin user, and everything looks fine again. Tried Firefox. Chrome, Edge, but all have same issue.
After playing around, I figured out it is not Azure AD plugin itself, because if I use
Matrix-based security or Project-based Matrix Authorization Strategy, UI is not broken.
Ofcourse, this doesn't mean Azure AD plugin is not culprit.
Here are couple of screenshots, where you can see than with Azure AD matrix based strategy, Disable this project and Quiet period are in upper right corner, all options are, even not checked, are behaving like checked, and pipeline field where you should enter code is missing,
I have another jenkins instance with older version (with old UI) and all is fine there, this is my first instance with new UI, so must be something related to new version and azure ad plugin.