Hidden columns can not be made visible

Hello, I have a question: I have created an extensive notes table with columns. Every time I open idoceo, almost all columns are hidden, so I can't edit anything. When I try to show them manually and tediously click on them one by one via the settings, the columns are still gone. The app is so not usable and I'm pretty frustrated. It would be great if someone has a tip for me.

Many greetings
Jasmin

Hello Jasmin,
There is no need to manually click them one by one. It can be done automatically and it will stay that way.
Send us when you have a chance an e-mail from the app. Tap on help > Support&Suggestions. It looks like an issue with your iOS/macOS/iDoceo version and need to know those details.

It turned out the folder holding those columns was closed.

Folders have to be open if you wish columns inside to remain visible.