I am still a beginner.
I created a printing preview in Print composer, with a general map on the background and several small frames on top, containing zoomed-in portions of the general map.
With the "Overviews" tab, in the "Item properties", I linked the small frames to the relative area in the general map, which now is also surrounded by a frame. I would now like to know if there is a way to create a visual connection between these two frames (e.g. an arrow connecting the frame on the general map to the small frame with the zoomed-in portion) without having to draw it manually. I can not find a function for that.