I am unsure if this is the appropriate forum to post this, but I accidentally clicked on a button (of which I have no idea what it is) and now my clips folder (where clips, when imported, their thumbnails and videos are shown in a scrollable box near the top left corner) and I have no clue how to get it back, is anyone available to help? Thank you in advance.

You probably changed the (default) layout .. (which is "edit" mode).

On the top right of the screen you should have a list of button with different kind of layout.. (such as: edit - audio - effect )..

Click on the "edit" button and you should return to the original/default KDENLive view/layout.