Fruti26

Warning this might be a nooby question but I'm concerned about it. I have seen many Youtubers posting videos, in which they use the Vicinity window to pick items up. I heard that you open it by pressing the Tab key, however this is not the case for me nothing happens when I press Tab and I don't know if I'm stupid or if this is a setting issue or a bug. Please for help and thanks for any reasonable answers.