Welcome to the community sophielanoix.
First, let’s just check whether you’ve somehow ended up inside a directory without realizing it. Similar to the situation here.
If you look at the top of the file browser, are there any directories listed after the folder icon? You can return to the main folder by clicking the grey folder icon below the filter files box.
For example, in the image below I’m in the directory testdir/adirectory. I can return to testdir by clicking on where it says testdir, or I can return to my home directory by clicking on the grey folder icon before testdir.
Did that help at all? If it’s not that, we can keep digging.