TAB Arguments doesn't work

I searched a lot but didn't find an answer so I'm posting here. Even my statistics prof doesn't know what's up. I use RStudio for Uni and have an exam in a month. I failed it last time and it was because I didn't know the default arguments. In the Guide I've read you should be able to see the arguments with TAB. I watched youtube videos and looked at the podcast of my prof and tried it exactly the same (with the curser at the exact same spot) but it only shows the possible completions. I need to see the arguments. I think I need to change something in the settings of RStudio but I really can't find it.
Hope you guys can help me!
Thank you


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