I want to use illustrator to concatenate my PDF graphics, which were generated using python cartopy. But when I moved the two maps closer, I got an error and I couldn’t move the maps. The detailed error information is as follows: Error: Can’t move the objects. The requested transformation would make some objects fall completely off the drawing area.

Then I turn on outline mode (Ctrl+Y), you can see that there are a lot of outlines outside the artboard, which may be the reason why the graphics can not be joined.
I tried to select and delete these lines outside the artboard, but I did not succeed, I hope to get professional help here. Thank you all in advance for your help.