Ok this is on a fresh installation: http://quick.as/bqohdxm4
I pulled the starterkit and created a new site.
As you’ll see the toggle stops working as soon as all the the projects are set to invisible.
I can confirm that I’m running the following:
Toolkit version: 2.4.0
Kirby version: 2.4.0
Panel version: 2.4.0
I’m on php 7 using MAMP.