Hiding certain tabs from non admins

Hello @Sommerregen,
now it works reliably! Thank you so much for your effort! :-)

Hi @anyway, thank you for your effort and reporting the issue, too! Great to hear it is working now :-D

One final question: Is it possible to hide the "Advanced" tab too? It is only admin stuff in there, which I don't want the user playing around with. This is mentioned here #411, but it's not explained how and where the "Admin Plugin" tabs can be controlled. It is for sure not useful to write something directly into the core files of the plugin.