I was able to solve my problem; I had to make a change in the basic settings.
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Many thanks for the quick reply. Unfortunately, this keyboard shortcut is always without function for me ...
I would like to test on my desktop how my app behaves on the different devices. I should actually click F12 in the preview. The icon (a monitor and a mobile phone) for the different devices should then be located there. However, this icon is not there. Can someone please tell me how to get there?