Andrew,
If they are vector graphics, you should be able to resize them without loss of quality right in Corel Draw. This may require that you have a “large” and “small” format of your graphic.
I’m not sure what you mean, “I came across a limit there was not enough of working are[a] in pan mode”. You can resize the pan/crop viewing area by using the slider control on the lower left side of the Pan/Crop window titled Workspace – Zoom %. You can also change the size of the graphic from within the Pan/Zoom window by either dragging the bounding box handles, or changing the Position (Width or Height) value directly.
Hopefully, this gives you some ideas as to what can be done.
Andrew Lenczycki