I have tried this on three different installations. Two running Drupal 8.1.8 and one on 8.1.9. One of these was a new install with nothing configured out of the box. There is no form at all on the admin screen at /admin/structure/display-modes/form/config-form-modes. PHP version is 7.0.8.

After some troubleshooting I found that there is a form element set as a select when it should be 'details'. Once I change that the form displays again and seems to work. Patch coming, I think.

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#2 Admin_screen_is_blank-2797519-1.patch723 bytesmegan_m
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mmcdermott created an issue. See original summary.

megan_m’s picture

Here's the patch.

eme’s picture

Status: Active » Fixed

Has been fixed.

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.