How do I edit existing standard POIs as they usually show too long text and I cannot read the remaining relevant info?
You can’t. It’s not possible to edit the standard POI’s that get shipped with the GO. However, it IS possible to view the rest of the text. To see the name in full length, you have keep your finger (or whatever you are using) on the line of your choice. You will see the complete information in a smaller font. You can, with your finger still on the screen, scroll (slide) up or down the screen. If what you want is not on the screen, slide to the scroll area and let the finger go. Then scroll up or down and repeat the action.