I have one client where the "Show View State in Development Mode" checkbox field is missing on the User detail screen, so I can't enable View State. The user has a full Salesforce license and is a sys admin. I can enable the Development Mode checkbox but that doesn't give me the View State tab on the footer.
When I look into other clients' instances, they do display the "Show View State" checkbox in the User record.
These are all production instances and all in Winter 19. I've done some searching but can't find any explanation as to why the checkbox is missing. Has anyone seen this before?
Update: The VF page in the original instance does have an
<apex:form> tag and it's using a custom controller.