Commands in Photoshop not available

Hello, I have a collection of jpg files that I should edit in LR and PS. I can edit them in LR and open them in PS, but then almost all commands in the drop down menu are not available (are grey). So e.g. there is no command under "Filter", non under "Select" etc. . What can I do to solve this problem? Is there only a tick in the settings missing?

I work with the latest Version of LR and PS.

Thanks for you help.

Stefanie