Slidemaster is shown in use, although it is not in use

Hello Florian and welcome to E-Learning Heroes :)

Thanks for contacting us and sharing what you are running into with your project file.

A quick tip I learned from our community is to place a red x on the slide master/layout that you cannot delete so that it will be easy to see at a glance when taking a look at your project.

If you need us to take a look, then with your permission, please share your project file publicly here, or send it to me privately by uploading it here. I'll delete it when I'm done troubleshooting.

Hi Leslie,

thanks for the answer. Sice I still cannot find the specific slide, I'll provide the course here, so that you can have a look at it.

check if you have and question banks

At a quick glance, I cannot determine where this is in use either, Florian.

I've opened up a support case on your behalf so that one of our support engineers can dig in and take a look. You should be hearing from someone via e-mail soon.