Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
the My Mapy screen right pane, which includes the list of the GPX files, can be hidden or displayed, but its width cannot be extended.
This is very useful to display GPX file with long descriptions